rtc: rtc-s3c: Add extra option to include RTC for Samsung SoCs

This patch adds HAVE_S3C_RTC to control inclusion of RTC driver for Samsung
SoCs. This option will help to include the driver only for the necessary
machines and not for any given arch.
Signed-off-by: Atul Dahiya <atul.dahiya@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>

drivers/rtc/Kconfig

@@ -645,9 +645,16 @@ config RTC_DRV_OMAP
 	  DA8xx/OMAP-L13x chips.  This driver can also be built as a
 	  module called rtc-omap.
 
+config HAVE_S3C_RTC
+	bool
+	help
+	  This will include RTC support for Samsung SoCs. If
+	  you want to include RTC support for any machine, kindly
+	  select this in the respective mach-XXXX/Kconfig file.
+
 config RTC_DRV_S3C
 	tristate "Samsung S3C series SoC RTC"
-	depends on ARCH_S3C2410 || ARCH_S3C64XX
+	depends on ARCH_S3C2410 || ARCH_S3C64XX || HAVE_S3C_RTC
 	help
 	  RTC (Realtime Clock) driver for the clock inbuilt into the
 	  Samsung S3C24XX series of SoCs. This can provide periodic