rtc: Make mc13783-rtc driver generic

Rename mc13783-rtc so that it can be used for both MC13783 and MC13892 PMICs.

efikamx board, for example, does use a MC13892 PMIC, but the RTC selection is currently made as:

#define CONFIG_RTC_MC13783

,which is not very obvious.

Let the MC13783 and MC13892 RTC be selected by:

#define CONFIG_RTC_MC13XXX

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index df440c6..a16f590 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -50,7 +50,7 @@
 COBJS-$(CONFIG_RTC_M41T94) += m41t94.o
 COBJS-$(CONFIG_RTC_M48T35A) += m48t35ax.o
 COBJS-$(CONFIG_RTC_MAX6900) += max6900.o
-COBJS-$(CONFIG_RTC_MC13783) += mc13783-rtc.o
+COBJS-$(CONFIG_RTC_MC13XXX) += mc13xxx-rtc.o
 COBJS-$(CONFIG_RTC_MC146818) += mc146818.o
 COBJS-$(CONFIG_MCFRTC) += mcfrtc.o
 COBJS-$(CONFIG_RTC_MK48T59) += mk48t59.o
diff --git a/drivers/rtc/mc13783-rtc.c b/drivers/rtc/mc13xxx-rtc.c
similarity index 100%
rename from drivers/rtc/mc13783-rtc.c
rename to drivers/rtc/mc13xxx-rtc.c