ARM: configs: sunxi: enable Realtek PHY

Lot of sunxi boards has a Realtek PHY, so let's enable it.
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Jernej Skrabec <jernej.skrabec@siol.net>
Link: https://lore.kernel.org/r/20201112202652.27676-1-clabbe@baylibre.com

arch/arm/configs/sunxi_defconfig

@@ -51,6 +51,7 @@ CONFIG_STMMAC_ETH=y
 # CONFIG_NET_VENDOR_VIA is not set
 # CONFIG_NET_VENDOR_WIZNET is not set
 CONFIG_MICREL_PHY=y
+CONFIG_REALTEK_PHY=y
 # CONFIG_WLAN is not set
 CONFIG_INPUT_EVDEV=y
 CONFIG_KEYBOARD_SUN4I_LRADC=y