i2c: normal_i2c can be made const (rtc drivers)

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Alessandro Zummo <alessandro.zummo@towertech.it>
diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 1c74364..725b0c7 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -61,7 +61,7 @@
 /* i2c configuration */
 #define ISL1208_I2C_ADDR 0xde
 
-static unsigned short normal_i2c[] = {
+static const unsigned short normal_i2c[] = {
 	ISL1208_I2C_ADDR>>1, I2C_CLIENT_END
 };
 I2C_CLIENT_INSMOD; /* defines addr_data */