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Revert "power*/SYS.h: implement _SYSCALL_BODY() macro"

Description

Revert "power*/SYS.h: implement _SYSCALL_BODY() macro"

bapt reports build errors on powerpc/powerpc so this is the most likely
culprit.

This reverts commit e88e1272792e41cbf0a5af1f5f0a858afece0475.