imx6: icorem6: Add ENET support

Add enet support for engicam icorem6 qdl starter kit.
- Add pinmux settings
- Add board_eth_init

TFTP log:
--------
Net:   FEC [PRIME]
Hit any key to stop autoboot:  0
icorem6qdl> tftpboot {fdt_addr} imx6dl-icore.dtb
Using FEC device
TFTP from server 192.168.2.96; our IP address is 192.168.2.75
Filename 'imx6dl-icore.dtb'.
Load address: 0x0
Loading: ######
         1.3 MiB/s
done
Bytes transferred = 28976 (7130 hex)
CACHE: Misaligned operation at range [00000000, 00007130]
icorem6qdl>

Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/configs/imx6qdl_icore_mmc_defconfig b/configs/imx6qdl_icore_mmc_defconfig
index ced6b10..c2c2fe8 100644
--- a/configs/imx6qdl_icore_mmc_defconfig
+++ b/configs/imx6qdl_icore_mmc_defconfig
@@ -14,6 +14,8 @@
 # CONFIG_CMD_IMLS is not set
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_GPIO=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_CACHE=y
@@ -23,7 +25,9 @@
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_OF_LIBFDT=y
+CONFIG_FEC_MXC=y
 CONFIG_MXC_UART=y
+CONFIG_NETDEVICES=y
 CONFIG_IMX_THERMAL=y
 CONFIG_SPL_LIBDISK_SUPPORT=y
 CONFIG_SPL_LIBCOMMON_SUPPORT=y