sunxi: a53: fix ethernet on a64-olinuxino

a64-olinuxino board has Micrel KSZ9031 Gigabit PHY so add support for
this PHY into kernel.

Signed-off-by: Petr Štetiar <[email protected]>

target/linux/sunxi/cortexa53/config-5.4

@@ -123,6 +123,7 @@ CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE=y
 CONFIG_KVM_ARM_PMU=y
 CONFIG_KVM_INDIRECT_VECTORS=y
 CONFIG_MDIO_BUS_MUX=y
+CONFIG_MICREL_PHY=y
 CONFIG_MODULES_USE_ELF_RELA=y
 CONFIG_NEED_SG_DMA_LENGTH=y
 CONFIG_NO_IOPORT_MAP=y