imx8mn_evk: Add Ethernet support to the LPDDR4 variant

The imx8mn-ddr4-evk board has Ethernet support already, but the
lpddr4 board does not.

Add Ethernet support for the LPDDR4 variant too.

Signed-off-by: Fabio Estevam <festevam@denx.de>
diff --git a/configs/imx8mn_evk_defconfig b/configs/imx8mn_evk_defconfig
index c18c19f..52954b0 100644
--- a/configs/imx8mn_evk_defconfig
+++ b/configs/imx8mn_evk_defconfig
@@ -46,6 +46,9 @@
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_REGULATOR=y
 CONFIG_CMD_EXT4_WRITE=y
@@ -70,7 +73,12 @@
 CONFIG_SPL_MMC_HS400_SUPPORT=y
 CONFIG_FSL_USDHC=y
 CONFIG_PHYLIB=y
+CONFIG_PHY_ATHEROS=y
 CONFIG_DM_ETH=y
+CONFIG_DM_ETH_PHY=y
+CONFIG_PHY_GIGE=y
+CONFIG_FEC_MXC=y
+CONFIG_MII=y
 CONFIG_PINCTRL=y
 CONFIG_SPL_PINCTRL=y
 CONFIG_PINCTRL_IMX8M=y