arm64, jump label: optimize jump label implementation

Optimize jump label implementation for ARM64 by dynamically patching
kernel text.

Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jiang Liu <liuj97@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --cc arch/arm64/Kconfig
Simple merge

diff --cc arch/arm64/include/asm/jump_label.h
Simple merge

diff --cc arch/arm64/kernel/Makefile
Simple merge

diff --cc arch/arm64/kernel/jump_label.c
Simple merge