net: stmmac: move PHY attachment error message into stmmac_init_phy()

Move the "cannot attach to PHY" error message into stmmac_init_phy()
so we don't end up with multiple error messages printed when things
go wrong. Drop the function name from the message, and use %pe to
print the error code description rather than just a number.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/E1v119t-00000007744-2SxG@rmk-PC.armlinux.org.uk


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