drivers/rtc: broken link fix

In drivers/rtc/rtc-rx8025.c is a broken link that is supposed to
lead to a form allowing users to subscribe to the lm-sensors mailing list.

The link <http://lists.lm-sensors.org/mailman/listinfo/lmsensors> leads
to a page with a 404 error. I believe the link should be replaced
with <lm-sensors@lm-sensors.org>.
Signed-off-by: NLeslie Lau <laulinxk@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/rtc/rtc-rx8025.c

@@ -7,7 +7,7 @@
  * All rights reserved.
  *
  * Modified by fengjh at rising.com.cn
- * <http://lists.lm-sensors.org/mailman/listinfo/lm-sensors>
+ * <lm-sensors@lm-sensors.org>
  * 2006.11
  *
  * Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com>