sfp: add support for 5gbase-t SFPs

The sfp_parse_support() function is setting 5000baseT_Full in some cases.
Now that we have PHY_INTERFACE_MODE_5GBASER interface mode available,
change sfp_select_interface() to return PHY_INTERFACE_MODE_5GBASER if
5000baseT_Full is set in the link mode mask.

Signed-off-by: Marek Behún <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/phy/sfp-bus.c

···
 	    phylink_test(link_modes, 10000baseT_Full))
 		return PHY_INTERFACE_MODE_10GBASER;
 
+	if (phylink_test(link_modes, 5000baseT_Full))
+		return PHY_INTERFACE_MODE_5GBASER;
+
 	if (phylink_test(link_modes, 2500baseX_Full))
 		return PHY_INTERFACE_MODE_2500BASEX;