board: vf610twr: convert to DM_I2C

Conversion to DM_I2C is mandatory, enable DM_I2C
to disable board removal warning.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/configs/vf610twr_nand_defconfig b/configs/vf610twr_nand_defconfig
index c50afc4..2cef898 100644
--- a/configs/vf610twr_nand_defconfig
+++ b/configs/vf610twr_nand_defconfig
@@ -48,7 +48,7 @@
 CONFIG_ENV_RANGE=0x80000
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_VYBRID_GPIO=y
-CONFIG_SYS_I2C_LEGACY=y
+CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MXC=y
 CONFIG_FSL_ESDHC_IMX=y
 CONFIG_MTD=y