rtc: rv3029: reword Kconfig option

The Kconfig option for rv3029 is not mentioning any part number, explicitly
show rv3029.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/Kconfig

@@ -594,10 +594,10 @@ config RTC_DRV_EM3027
 	  will be called rtc-em3027.
 
 config RTC_DRV_RV3029C2
-	tristate "Micro Crystal RTC"
+	tristate "Micro Crystal RV3029"
 	help
 	  If you say yes here you get support for the Micro Crystal
-	  RV3029-C2 RTC chips.
+	  RV3029 RTC chips.
 
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-rv3029c2.