rtc: Add RTC chip pcf2127 support

This driver compatible with pcf2127 and pcf2129

Signed-off-by: Meng Yi <meng.yi@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index b5d9048..57af1b5 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -13,4 +13,10 @@
 	  drivers to perform the actual functions. See rtc.h for a
 	  description of the API.
 
+config RTC_PCF2127
+	bool "Enable PCF2127 driver"
+	depends on DM_RTC
+	help
+	  Enable pcf2127 driver which provides rtc get and set function
+
 endmenu