configs: socfpga: convert i2c to dm

Enable DM I2C driver on SoCFPGA platforms.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
diff --git a/include/configs/socfpga_common.h b/include/configs/socfpga_common.h
index cf1f2b1..025c7de 100644
--- a/include/configs/socfpga_common.h
+++ b/include/configs/socfpga_common.h
@@ -137,6 +137,7 @@
 /*
  * I2C support
  */
+#ifndef CONFIG_DM_I2C
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_BASE		SOCFPGA_I2C0_ADDRESS
 #define CONFIG_SYS_I2C_BASE1		SOCFPGA_I2C1_ADDRESS
@@ -157,6 +158,7 @@
 unsigned int cm_get_l4_sp_clk_hz(void);
 #define IC_CLK				(cm_get_l4_sp_clk_hz() / 1000000)
 #endif
+#endif /* CONFIG_DM_I2C */
 
 /*
  * QSPI support