rtc: Kconfig: Name RK818 in Kconfig for RTC_DRV_RK808

The RK808 and RK818 PMICs are using a similar register map.
We can reuse the rtc driver for the RK818 PMIC. So let's add
the RK818 in the Kconfig description.
Signed-off-by: NWadim Egorov <w.egorov@phytec.de>
Acked-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/rtc/Kconfig

@@ -328,11 +328,11 @@ config RTC_DRV_MAX77686
 	  will be called rtc-max77686.
 
 config RTC_DRV_RK808
-	tristate "Rockchip RK808 RTC"
+	tristate "Rockchip RK808/RK818 RTC"
 	depends on MFD_RK808
 	help
 	  If you say yes here you will get support for the
-	  RTC of RK808 PMIC.
+	  RTC of RK808 and RK818 PMIC.
 
 	  This driver can also be built as a module. If so, the module
 	  will be called rk808-rtc.