Mark, you're absolutely right, and I have a local copy of that same idea.
WRT your patches, I have some nitpicks. I think the generated srpm should be the same in both CentOS and Fedora, which could be solved by including "the other one" as a source
If you'd like take on the task of getting this upstreamed to Fedora, you'd be helping me "a lot", if not, just know that it is in my to-do list :-)

Pablo.

First of all congratulations and thanks for the latest 7.7 release; updated several systems without issues!
 

As mentioned in an other conversation it is the logical continuation of 7.6-updates nevertheless found some nice surprises in the armhfp and especially aarch64 extras repository's including updated u-boot images

This being said it saddens me to see in the source file of the uboot-tools-2019.07-3 they still carry a Fedora specific patch. While it is not a difficult fix the get centosisms in. Especially since the upstream maintainer (intentionally?) reverted the order of first two distro specific patches. (This makes a clean patch possible without patching the patch.)

I know it is not a encouraged to boot aarch64 on our SBC's, nor is it my objective to promote this.
But an easy route I use for over an year is though uboot-uefi boot > grub2.
And have to say I like it a lot, with an (serial)monitor attracted you can choose the kernel in grub2;
or partion you want to boot (if you happen to feel to be inclined  to have a multiboot-environment)

after re-basing to uboot-tools-2019.07-3 
( https://github.com/markVnl/rpms-uboot-tools/compare/centos...el7 )
these two patches do the job for me:

>From 98a2c15275a5fe154cf80344b7538d72ecb00645 Mon Sep 17 00:00:00 2001
From: Mark Verlinde <mark@havak.nl>
Date: Fri, 20 Sep 2019 13:29:10 +0200
Subject: [PATCH 1/2] uefi use Centos specific path name

---
 uefi-use-Centos-specific-path-name.patch | 50 ++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 uefi-use-Centos-specific-path-name.patch

diff --git a/uefi-use-Centos-specific-path-name.patch b/uefi-use-Centos-specific-path-name.patch
new file mode 100644
index 0000000..14abac1
--- /dev/null
+++ b/uefi-use-Centos-specific-path-name.patch
@@ -0,0 +1,50 @@
+From dd6a7a9726e5d79bb053d3ab0a8b0ae273140bce Mon Sep 17 00:00:00 2001
+From: Mark Verlinde <mark@havak.nl>
+Date: Tue, 25 Dec 2018 15:28:56 +0100
+Subject: [PATCH 1/1] uefi use Centos specific path name
+
+Signed-off-by: Mark Verlinde <mark@havak.nl>
+---
+ include/config_distro_bootcmd.h | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/include/config_distro_bootcmd.h b/include/config_distro_bootcmd.h
+index 47e98e14ac..aa4b24d4de 100644
+--- a/include/config_distro_bootcmd.h
++++ b/include/config_distro_bootcmd.h
+@@ -92,9 +92,9 @@
+ 
+ #ifdef CONFIG_EFI_LOADER
+ #if defined(CONFIG_ARM64)
+-#define BOOTEFI_NAME "bootaa64.efi"
++#define BOOTEFI_NAME "grubaa64.efi"
+ #elif defined(CONFIG_ARM)
+-#define BOOTEFI_NAME "bootarm.efi"
++#define BOOTEFI_NAME "grubarm.efi"
+ #elif defined(CONFIG_X86_RUN_32BIT)
+ #define BOOTEFI_NAME "bootia32.efi"
+ #elif defined(CONFIG_X86_RUN_64BIT)
+@@ -130,7 +130,7 @@
+ 			"bootefi bootmgr ${fdtcontroladdr};"              \
+ 		"fi;"                                                     \
+ 		"load ${devtype} ${devnum}:${distro_bootpart} "           \
+-			"${kernel_addr_r} efi/boot/"BOOTEFI_NAME"; "      \
++			"${kernel_addr_r} efi/centos/"BOOTEFI_NAME"; "    \
+ 		"if fdt addr ${fdt_addr_r}; then "                        \
+ 			"bootefi ${kernel_addr_r} ${fdt_addr_r};"         \
+ 		"else "                                                   \
+@@ -165,9 +165,9 @@
+ 		"run boot_efi_binary\0"                                   \
+ 	"scan_dev_for_efi="                                               \
+ 		"if test -e ${devtype} ${devnum}:${distro_bootpart} "     \
+-					"efi/boot/"BOOTEFI_NAME"; then "  \
++					"efi/centos/"BOOTEFI_NAME"; then "\
+ 				"echo Found EFI removable media binary "  \
+-					"efi/boot/"BOOTEFI_NAME"; "       \
++					"efi/centos/"BOOTEFI_NAME"; "     \
+ 				"run scan_dev_for_dtb; "                  \
+ 				"echo EFI LOAD FAILED: continuing...; "   \
+ 		"fi; "                                                    \
+-- 
+2.16.5
+