[Arm-dev] CONFIG_HZ for arm64

Hi Jim and all,

I notice that CONFIG_HZ_1000=y in config-generic, and CONFIG_HZ=100 in
config-generic.

This will result in a final .config for arm64 with
CONFIG_HZ_1000=y
CONFIG_HZ=1000

instead of 100 as intended.

config-arm64 needs to be changed to specify CONFIG_HZ_100=y instead of
CONFIG_HZ=100, so the final
dotconfig will be

CONFIG_HZ_100=y
CONFIG_HZ=100

Please comment.

-Phong