cxgb4: Adds support for T6 adapter

Adds NIC driver related changes for T6 adapter. Register related
changes, MC related changes, VF related changes, doorbell related
changes, debugfs changes, etc

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

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

diff --cc drivers/net/ethernet/chelsio/cxgb4/t4_msg.h
Simple merge

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

diff --cc drivers/net/ethernet/chelsio/cxgb4/t4_values.h
Simple merge

diff --cc drivers/net/ethernet/chelsio/cxgb4/t4fw_api.h
Simple merge

diff --cc drivers/net/ethernet/chelsio/cxgb4/t4fw_version.h
Simple merge