PC-BSD/trueos 147a9bbsys/amd64/include atomic.h, sys/i386/include atomic.h

Make sure kernel modules built by default are portable between UP and
SMP systems by extending defined(SMP) to include defined(KLD_MODULE).

This is a regression issue after r335873 .

Discussed with:         mmacy@
Sponsored by:           Mellanox Technologies
DeltaFile
+2-2sys/amd64/include/atomic.h
+2-2sys/i386/include/atomic.h
+4-42 files

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