Add support for Intersil isl1208 RTC

Signed-off-by: Tor Krill <tor@excito.com>
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 2af2bf4..61bbbf4 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -53,6 +53,7 @@
 COBJS-y += rx8025.o
 COBJS-y += mcfrtc.o
 COBJS-y += x1205.o
+COBJS-$(CONFIG_RTC_ISL1208) += isl1208.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)