net/cxgbe: rework and use 32-bit port capability

net/cxgbe: rework and use 32-bit port capability

The new code uses the new 32-bit Port Capabilities exclusively and
only translates to/from the old 16-bit Port Capabilities at the last
point possible when talking to older Firmware.

For the old versus new Firmware issue, we use the new FW_PARAMS_CMD[PFVF,
CAPS32] command to tell the Firmware that we want Asynchronous Port Status
updates to use the new 32-bit version of the Port Information message.  If
we get an error, we know we're dealing with older Firmware, and if not,
we'll start getting th new 32-bit Port Capability message formats.

Also, refactor t4_handle_fw_rpl() to handle new 32-bit Port Capability
replies from firmware in t4_handle_get_port_info().

Original work by Surendra Mobiya <surendra@chelsio.com>

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>