ARM: SAMSUNG: Make RTC driver dependency SoC specific instead of machine specific

This patch moves the dependency of RTC driver from MACH_XXX(board) to
ARCH_XXX(SoC). This will enable all machines using Samsung S5P6440, S5PC100
and S5PV210 SoCs to use RTC driver by default.
Signed-off-by: NAtul Dahiya <atul.dahiya@samsung.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

arch/arm/Kconfig

@@ -672,6 +672,7 @@ config ARCH_S5P6440
 	select GENERIC_GPIO
 	select HAVE_CLK
 	select ARCH_USES_GETTIMEOFFSET
+	select HAVE_S3C_RTC
 	help
 	  Samsung S5P6440 CPU based systems
 
@@ -691,6 +692,7 @@ config ARCH_S5PC100
 	select CPU_V7
 	select ARM_L1_CACHE_SHIFT_6
 	select ARCH_USES_GETTIMEOFFSET
+	select HAVE_S3C_RTC
 	help
 	  Samsung S5PC100 series based systems
 
@@ -701,6 +703,7 @@ config ARCH_S5PV210
 	select HAVE_CLK
 	select ARM_L1_CACHE_SHIFT_6
 	select ARCH_USES_GETTIMEOFFSET
+	select HAVE_S3C_RTC
 	help
 	  Samsung S5PV210/S5PC110 series based systems