rtc: add support of mx27 rtc

This driver has been tested on board armadeus apf27.

Signed-off-by: Philippe Reynes <tremyfr@yahoo.fr>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 4d6cbc4..8316e8f 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -59,6 +59,7 @@
 COBJS-$(CONFIG_RTC_MPC5200) += mpc5xxx.o
 COBJS-$(CONFIG_RTC_MPC8xx) += mpc8xx.o
 COBJS-$(CONFIG_RTC_MV) += mvrtc.o
+COBJS-$(CONFIG_RTC_MX27) += mx27rtc.o
 COBJS-$(CONFIG_RTC_MXS) += mxsrtc.o
 COBJS-$(CONFIG_RTC_PCF8563) += pcf8563.o
 COBJS-$(CONFIG_RTC_PL031) += pl031.o