rtc: Add support for the rtc found in the MC13892 PMIC

The mfd driver for MC13783 recently got support for MC13892 and was
renamed accordingly from mc13783-core to mc13xxx-core.  Do the same for
rtc-mc13783.

The only relevant change is to use platform id's to tell the platform bus
that this driver is responsible for mc13892-rtc devices, too.

Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 23579d6..2883428 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -936,11 +936,12 @@
 	  If you say Y here you will get support for the RTC found on
 	  the PCAP2 ASIC used on some Motorola phones.
 
-config RTC_DRV_MC13783
-	depends on MFD_MC13783
-	tristate "Freescale MC13783 RTC"
+config RTC_DRV_MC13XXX
+	depends on MFD_MC13XXX
+	tristate "Freescale MC13xxx RTC"
 	help
-	  This enables support for the Freescale MC13783 PMIC RTC
+	  This enables support for the RTCs found on Freescale's PMICs
+	  MC13783 and MC13892.
 
 config RTC_DRV_MPC5121
 	tristate "Freescale MPC5121 built-in RTC"