PC-BSD/trueos dd98a57sys/arm/include atomic.h, sys/mips/include atomic.h

Implement atomic_swap_xxx() for all platforms.

Differential Revision:  https://reviews.freebsd.org/D18450
Reviewed by:            kib@
MFC after:              3 days
Sponsored by:           Mellanox Technologies
DeltaFile
+64-0sys/mips/include/atomic.h
+7-0sys/arm/include/atomic.h
+3-0sys/powerpc/include/atomic.h
+74-03 files

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