cxgb4: Add the MC1 registers to read in the interrupt handler

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
Simple merge

diff --cc drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
Simple merge