arch: arm64: remove `CONFIG_ARM64_ENABLE_FRAME_POINTER`

`CONFIG_ARM64_ENABLE_FRAME_POINTER` had been deprecated since #72646
for 2 releases and served not functional effect, it's now time to
say goodbye.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>