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>

include/configs/imx8mp_evk.h

@@ -44,6 +44,22 @@
 
 #endif
 
+#if defined(CONFIG_CMD_NET)
+#define CONFIG_ETHPRIME                 "eth1" /* Set eqos to primary since we use its MDIO */
+
+#define CONFIG_FEC_XCV_TYPE             RGMII
+#define CONFIG_FEC_MXC_PHYADDR          1
+#define FEC_QUIRK_ENET_MAC
+
+#define DWC_NET_PHYADDR			1
+#ifdef CONFIG_DWC_ETH_QOS
+#define CONFIG_SYS_NONCACHED_MEMORY     (1 * SZ_1M)     /* 1M */
+#endif
+
+#define PHY_ANEG_TIMEOUT 20000
+
+#endif
+
 /* Initial environment variables */
 #define CONFIG_EXTRA_ENV_SETTINGS		\
 	"script=boot.scr\0" \