imx: imx8mp_evk: enable eth support

Add board code to configure the network interface
Add net defconfig

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/configs/imx8mp_evk_defconfig b/configs/imx8mp_evk_defconfig
index 6166d10..2e4f517 100644
--- a/configs/imx8mp_evk_defconfig
+++ b/configs/imx8mp_evk_defconfig
@@ -45,6 +45,9 @@
 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_EXT2=y
@@ -74,8 +77,12 @@
 CONFIG_MMC_HS400_ES_SUPPORT=y
 CONFIG_MMC_HS400_SUPPORT=y
 CONFIG_FSL_ESDHC_IMX=y
-CONFIG_PHYLIB=y
+CONFIG_PHY_REALTEK=y
 CONFIG_DM_ETH=y
+CONFIG_PHY_GIGE=y
+CONFIG_DWC_ETH_QOS=y
+CONFIG_FEC_MXC=y
+CONFIG_MII=y
 CONFIG_PINCTRL=y
 CONFIG_SPL_PINCTRL=y
 CONFIG_PINCTRL_IMX8M=y