MFC r253217,253699

r253217:
Attach to the 4x10G T540-CR card.

r253699:
Expand the list of devices claimed by cxgbe(4).

Approved by:	re (kib)
MFC r253407:
Specify a timeout for the PL block.

Approved by:	re (kib)
Merge remote-tracking branch 'upstream-github/stable/9' into stable/9