drivers/rtc/rtc-isl1208.c: add support for the ISL1218

The ISL1218 chip is identical to the ISL1208, except that it has 6
additional user-storage registers.  This patch does not enable access to
those additional registers, but only adds the chip name to the list.

Signed-off-by: Ben Gardner <gardner.ben@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-isl1208.c

@@ -697,6 +697,7 @@ isl1208_remove(struct i2c_client *client)
 
 static const struct i2c_device_id isl1208_id[] = {
 	{ "isl1208", 0 },
+	{ "isl1218", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, isl1208_id);