tools: arm64: Import sysreg.h

Bring-in the kernel's arch/arm64/include/asm/sysreg.h
into tools/ for arm64 to make use of all the standard
register definitions in consistence with the kernel.

Make use of the register read/write definitions from
sysreg.h, instead of the existing definitions. A syntax
correction is needed for the files that use write_sysreg()
to make it compliant with the new (kernel's) syntax.

Reviewed-by: Andrew Jones <[email protected]>
Reviewed-by: Oliver Upton <[email protected]>
Signed-off-by: Raghavendra Rao Ananta <[email protected]>
[maz: squashed two commits in order to keep the series bisectable]
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]

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