arm: mvebu: db-mv784mp-gp_defconfig: Enable DM_I2C

Move to the DM I2C version, so that this board will not get dropped from
mainline.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/configs/db-mv784mp-gp_defconfig b/configs/db-mv784mp-gp_defconfig
index b82b637..6a11aa0 100644
--- a/configs/db-mv784mp-gp_defconfig
+++ b/configs/db-mv784mp-gp_defconfig
@@ -50,10 +50,8 @@
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SPL_OF_TRANSLATE=y
 CONFIG_SATA_MV=y
-CONFIG_SYS_I2C_LEGACY=y
-CONFIG_SPL_SYS_I2C_LEGACY=y
+CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MVTWSI=y
-CONFIG_SYS_I2C_SLAVE=0x0
 # CONFIG_MMC is not set
 CONFIG_MTD=y
 CONFIG_MTD_RAW_NAND=y