cam_ccb.h:

cam_ccb.h:
	Bring back the CAM_NEGOTIATE ccb flag.  This flag indicates
	that SPI transfer negotiation should occur concurrently with the
	execution of this CCB.  The flag is not yet used by the XPT but
	is required for proper support of multi-initiator configurations
	where topology scans cannot rely on a bus reset to invalidate
	prior negotiations.

cam_xpt.c:
	Don't allow DT transmission rates to be specified for devices
	that don't have the DT feature listed in their inquiry data.