arm64: percpu: implement optimised pcpu access using tpidr_el1

This patch implements optimised percpu variable accesses using the
el1 r/w thread register (tpidr_el1) along the same lines as arch/arm/.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --cc arch/arm64/include/asm/Kbuild
Simple merge

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

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

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