net: stmmac: add new mode parameter for fix_mac_speed

A mode parameter has been added to the callback function of fix_mac_speed
to indicate the physical layer type.

The mode can be one the following:
	MLO_AN_PHY	- Conventional PHY
	MLO_AN_FIXED	- Fixed-link mode
	MLO_AN_INBAND	- In-band protocol

Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
Link: https://lore.kernel.org/r/20230807160716.259072-2-shenwei.wang@nxp.com


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