dm: powerpc: P1020: add i2c DM support

This supports i2c DM for SoC P1020

Signed-off-by: Biwen Li <biwen.li@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/include/configs/P1022DS.h b/include/configs/P1022DS.h
index 5cc2e06..f8b035f 100644
--- a/include/configs/P1022DS.h
+++ b/include/configs/P1022DS.h
@@ -359,8 +359,8 @@
 #endif
 
 /* I2C */
+#ifndef CONFIG_DM_I2C
 #define CONFIG_SYS_I2C
-#define CONFIG_SYS_I2C_FSL
 #define CONFIG_SYS_FSL_I2C_SPEED	400000
 #define CONFIG_SYS_FSL_I2C_SLAVE	0x7F
 #define CONFIG_SYS_FSL_I2C_OFFSET	0x3000
@@ -368,6 +368,8 @@
 #define CONFIG_SYS_FSL_I2C2_SLAVE	0x7F
 #define CONFIG_SYS_FSL_I2C2_OFFSET	0x3100
 #define CONFIG_SYS_I2C_NOPROBES		{{0, 0x29}}
+#endif
+#define CONFIG_SYS_I2C_FSL
 
 /*
  * I2C2 EEPROM