arm: mvebu: theadorable_debug_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/theadorable_debug_defconfig b/configs/theadorable_debug_defconfig
index 556c91f..cfa1bac 100644
--- a/configs/theadorable_debug_defconfig
+++ b/configs/theadorable_debug_defconfig
@@ -58,10 +58,8 @@
 CONFIG_BOOTCOUNT_LIMIT=y
 CONFIG_BOOTCOUNT_RAM=y
 CONFIG_FPGA_ALTERA=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_SF_DEFAULT_SPEED=27777777
 CONFIG_SPI_FLASH_MACRONIX=y