configs: T4240RDB: enable DM_ETH

Enable DM_ETH and DM_MDIO for the T4240RDB.

Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/T4240RDB_SDCARD_defconfig b/configs/T4240RDB_SDCARD_defconfig
index 61670fa..2def901 100644
--- a/configs/T4240RDB_SDCARD_defconfig
+++ b/configs/T4240RDB_SDCARD_defconfig
@@ -28,6 +28,7 @@
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_IMLS=y
 CONFIG_CMD_GREPENV=y
+CONFIG_CMD_DM=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_USB=y
@@ -59,6 +60,8 @@
 CONFIG_PHY_CORTINA=y
 CONFIG_PHY_TERANETICS=y
 CONFIG_PHY_VITESSE=y
+CONFIG_DM_ETH=y
+CONFIG_DM_MDIO=y
 CONFIG_PHY_GIGE=y
 CONFIG_E1000=y
 CONFIG_FMAN_ENET=y