RTC: add support for DS1339 (using DS1307 driver)

Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
diff --git a/README b/README
index 1d71359..4fd8794 100644
--- a/README
+++ b/README
@@ -1152,6 +1152,7 @@
 		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
 		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
 		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
+		CONFIG_RTC_DS1339	- use Maxim, Inc. DS1339 RTC
 		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
 		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
 		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC