ARM: multi_v7_defconfig: Enable Samsung S3C SoC RTC

The rtc-s3c driver supports a range of S3C series Real-Time-Clocks found
on many Samsung SoCs. Build the driver as a module to support these RTC.
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/configs/multi_v7_defconfig

@@ -535,6 +535,7 @@ CONFIG_RTC_DRV_TPS65910=y
 CONFIG_RTC_DRV_S35390A=m
 CONFIG_RTC_DRV_EM3027=y
 CONFIG_RTC_DRV_DIGICOLOR=m
+CONFIG_RTC_DRV_S3C=m
 CONFIG_RTC_DRV_PL031=y
 CONFIG_RTC_DRV_AT91RM9200=m
 CONFIG_RTC_DRV_AT91SAM9=m