RTC: add support for DS1339 (using DS1307 driver)

Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 003d322..43f8546 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -16,6 +16,7 @@
 obj-$(CONFIG_RTC_DS1306) += ds1306.o
 obj-$(CONFIG_RTC_DS1307) += ds1307.o
 obj-$(CONFIG_RTC_DS1338) += ds1307.o
+obj-$(CONFIG_RTC_DS1339) += ds1307.o
 obj-$(CONFIG_RTC_DS1337) += ds1337.o
 obj-$(CONFIG_RTC_DS1374) += ds1374.o
 obj-$(CONFIG_RTC_DS1388) += ds1337.o