FreeBSD/src 1c00b27 (r354923)sys/dev/ahci ahci.c ahci.h

MFC r351589: Fix AHCI Enclosure Management, broken by r351356.

ivars value of -1 was used to distinguish EM device, and r351356 left some
wrong checks for it.  Give EM device separate flag there instead.
DeltaFile
+20-17sys/dev/ahci/ahci.c
+4-3sys/dev/ahci/ahci.h
+24-202 files

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