arm: amlogic: p212: Add support for Ethernet with Internal PHY

This patch adds support for the Internal RMII Ethernet PHY on the
Amlogic P212 Reference Board.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/configs/p212_defconfig b/configs/p212_defconfig
index 3c57621..d4b5349 100644
--- a/configs/p212_defconfig
+++ b/configs/p212_defconfig
@@ -20,6 +20,10 @@
 CONFIG_DM_GPIO=y
 CONFIG_DM_MMC=y
 CONFIG_MMC_MESON_GX=y
+CONFIG_DM_ETH=y
+CONFIG_ETH_DESIGNWARE=y
+CONFIG_PHY_MESON_GXL=y
+CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_MESON_GXL=y
 CONFIG_DEBUG_UART_MESON=y