blackfin: convert to use CONFIG_SYS_I2C framework

Signed-off-by: Scott Jiang <scott.jiang.linux@gmail.com>
diff --git a/include/configs/bf609-ezkit.h b/include/configs/bf609-ezkit.h
index f02e155..878009f 100644
--- a/include/configs/bf609-ezkit.h
+++ b/include/configs/bf609-ezkit.h
@@ -81,8 +81,8 @@
 #define CONFIG_PHYLIB
 
 /* i2c Settings */
+#define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_ADI
-#define CONFIG_HARD_I2C
 
 /*
  * Flash Settings