sfc: Remove unused efx_mae_mport_vf

efx_mae_mport_vf() has been unused since
commit 5227adff ("sfc: add mport lookup based on driver's mport data")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Acked-by: Martin Habets <habetsm.xilinx@gmail.com>
Link: https://patch.msgid.link/20241102151625.39535-3-linux@treblig.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>