mx53loco: Add DM_I2C support

The conversion to DM_I2C is mandatory, so add support
for it.

Signed-off-by: Fabio Estevam <festevam@denx.de>
diff --git a/configs/mx53loco_defconfig b/configs/mx53loco_defconfig
index e332c93..f497ccf 100644
--- a/configs/mx53loco_defconfig
+++ b/configs/mx53loco_defconfig
@@ -44,7 +44,7 @@
 CONFIG_USE_ETHPRIME=y
 CONFIG_ETHPRIME="FEC0"
 CONFIG_ARP_TIMEOUT=200
-CONFIG_SYS_I2C_LEGACY=y
+CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MXC=y
 CONFIG_FSL_ESDHC_IMX=y
 CONFIG_MTD=y