sfc: enumerate mports in ef100

MAE ports (mports) are the ports on the EF100 embedded switch such
as networking PCIe functions, the physical port, and potentially
others.

Signed-off-by: Alejandro Lucero <alejandro.lucero-palau@amd.com>
Acked-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>