configs: socfpga: convert i2c to dm

Enable DM I2C driver on SoCFPGA platforms.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
diff --git a/configs/socfpga_cyclone5_defconfig b/configs/socfpga_cyclone5_defconfig
index a687074..f6aaff5 100644
--- a/configs/socfpga_cyclone5_defconfig
+++ b/configs/socfpga_cyclone5_defconfig
@@ -42,6 +42,7 @@
 CONFIG_FPGA_SOCFPGA=y
 CONFIG_DM_GPIO=y
 CONFIG_DWAPB_GPIO=y
+CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_DW=y
 CONFIG_DM_MMC=y
 CONFIG_MMC_DW=y