rtc: imxdi: Initial support

Add support for Freescale's i.MX DryIce RTC, present on i.MX25.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 9cfdbf9..4d6cbc4 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -44,6 +44,7 @@
 COBJS-$(CONFIG_RTC_DS174x) += ds174x.o
 COBJS-$(CONFIG_RTC_DS3231) += ds3231.o
 COBJS-$(CONFIG_RTC_FTRTC010) += ftrtc010.o
+COBJS-$(CONFIG_RTC_IMXDI) += imxdi.o
 COBJS-$(CONFIG_RTC_ISL1208) += isl1208.o
 COBJS-$(CONFIG_RTC_M41T11) += m41t11.o
 COBJS-$(CONFIG_RTC_M41T60) += m41t60.o