bnx2x: Flow control enhancement

Setting better HW thresholds and enabling FW capabilities for better
enforcement. Also set the HW to more efficiently use the internal buffers if
this is a single port design

Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/bnx2x.h
Simple merge

diff --cc drivers/net/bnx2x_fw_defs.h
Simple merge

diff --cc drivers/net/bnx2x_hsi.h
Simple merge

diff --cc drivers/net/bnx2x_main.c
Simple merge

diff --cc drivers/net/bnx2x_reg.h
Simple merge