net: stmmac: anarion: use stmmac_pltfr_probe()

Rather than open-coding the call to anarion_gmac_init() and then
stmmac_dvr_probe(), omitting the cleanup of calling
anarion_gmac_exit(), use stmmac_pltfr_probe() which will handle this
for us.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1u4Fla-000XjM-Bw@rmk-PC.armlinux.org.uk


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