Add nvme_da back.

Now that it can co-exist in the kernel with nvd, add it back to the
cam module.

Sponsored by: Netflix

sys/modules/cam/Makefile

@@ -46,6 +46,7 @@ SRCS+=	ata_machdep.c
 SRCS+=	ata_pmp.c
 SRCS+=	nvme_all.c
 SRCS+=	nvme_xpt.c
+SRCS+=	nvme_da.c
 
 EXPORT_SYMS=	YES	# XXX evaluate