net: fec: phy: Don't advertise Gbit on (R)MII

Currently if a gigabit-capable PHY is connected to FEC via RMII or MII, it
will advertise 1000FULL and 1000HALF to a link partner.

Different problems may arise here:
- usually with (R)MII between MAC and PHY the PHY's connection to magnetics
would have only 2 pairs routed as well, otherwise a PHY can negotiate 1000
speed and there will be no traffic possible;
- but even if there is no way to negotiate 1000 speed in HW (only 2 signal
pairs routed), it may take a lot of time for PHY to figure this out; in
case of AD1300 it takes 17-20 seconds, which is waay longer than default
4s PHY_ANEG_TIMEOUT.

Use phy_set_supported() in such cases to disable gigabit advertised
options.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>

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