mpc5xxx_fec: add call to reset_phy() after PHY initialization

mpc5xxx_fec: add call to reset_phy() after PHY initialization

Some boards need their board-specific PHY quirks to be called
to PHY to work normally. As mpc5xxx_fec driver uses on demand
PHY initialization and can even reinit PHY during normal operation
we can't count on reset_phy() call from arch/<arch>/lib/board.c
(it is most likely called _before_ we init the PHY from the
driver) so we need to add call to reset_phy() directly in the
driver.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>