net: stmmac: anarion: use devm_stmmac_pltfr_probe()

Convert anarion to use devm_stmmac_pltfr_probe() which allows the
removal of an explicit call to stmmac_pltfr_remove().

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1u4Flf-000XjS-Fi@rmk-PC.armlinux.org.uk


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