cxgb4: Add debugfs facility to inject FL starvation

Add debugfs entry to inject Freelist starvation, used only for debugging
purpose.

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

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

diff --cc drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
Simple merge

diff --cc drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
Simple merge

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