configs: add eth dm support for all ColdFire boards

Add dm eth config options for all involved ColdFire-based boards.

Signed-off-by: Angelo Durgehello <angelo.dureghello@timesys.com>
diff --git a/configs/M54451EVB_stmicro_defconfig b/configs/M54451EVB_stmicro_defconfig
index 16cc02a..f9aa2d0 100644
--- a/configs/M54451EVB_stmicro_defconfig
+++ b/configs/M54451EVB_stmicro_defconfig
@@ -34,6 +34,8 @@
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_DM_ETH=y
+CONFIG_MCFFEC=y
 CONFIG_MII=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y