Merge branch 'cxgb4-ptp'

Atul Gupta says:

====================
cxgb4: Add PTP Hardware Clock (PHC) support

V4:
	Splitting the patch again
V3:
        Releasing lock in the exit paths
V2:
        Splitting the patch
====================

Signed-off-by: David S. Miller <davem@davemloft.net>