drivers/rtc: add Marvell Integrated RTC

This driver can be used for kirkwood SoCs by enabling CONFIG_RTC_MV.  Tested on
Global Scale Technologies Dreamplug.

Signed-off-by: Jason Cooper <u-boot@lakedaemon.net>
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index e4be4a4..ca27745 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -55,6 +55,7 @@
 COBJS-$(CONFIG_RTC_MK48T59) += mk48t59.o
 COBJS-$(CONFIG_RTC_MPC5200) += mpc5xxx.o
 COBJS-$(CONFIG_RTC_MPC8xx) += mpc8xx.o
+COBJS-$(CONFIG_RTC_MV) += mvrtc.o
 COBJS-$(CONFIG_RTC_PCF8563) += pcf8563.o
 COBJS-$(CONFIG_RTC_PL031) += pl031.o
 COBJS-$(CONFIG_RTC_PT7C4338) += pt7c4338.o