arm64: proc: remove unused cpu_get_pgd macro
arm64: proc: remove unused cpu_get_pgd macro

cpu_get_pgd isn't used anywhere and is Probably Not What You Want.
Remove it before anybody decides to use it.

Signed-off-by: Will Deacon <b913f13ef92ac157955c954ccaaff7be065faba4@arm.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs