i2c: Add missing KERN_* constants to printks

According to kerneljanitors todo list all printk calls (beginning
a new line) should have an according KERN_* constant.
Those are the missing pieces here for the i2c subsystem.

Signed-off-by: Frank Seidel <frank@f-seidel.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/i2c/algos/i2c-algo-pcf.c b/drivers/i2c/algos/i2c-algo-pcf.c
index 65a769f..d31147e 100644
--- a/drivers/i2c/algos/i2c-algo-pcf.c
+++ b/drivers/i2c/algos/i2c-algo-pcf.c
@@ -61,7 +61,7 @@
 
 static void i2c_start(struct i2c_algo_pcf_data *adap)
 {
-	DEBPROTO(printk("S "));
+	DEBPROTO(printk(KERN_DEBUG "S "));
 	set_pcf(adap, 1, I2C_PCF_START);
 }