ARM: S3C64XX: Kill CONFIG_PLAT_S3C64XX

CONFIG_PLAT_S3C64XX has been kept in place way too long since it was
marked as temporary in commit

110d85ac ARM: S3C64XX: Eliminate plat-s3c64xx

After fixing all users of it in previous patches, this patch finally
kills this temporary Kconfig entry.
Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/Kconfig

@@ -737,11 +737,13 @@ config ARCH_S3C64XX
 	select NEED_MACH_GPIO_H
 	select NO_IOPORT
 	select PLAT_SAMSUNG
+	select PM_GENERIC_DOMAINS
 	select S3C_DEV_NAND
 	select S3C_GPIO_TRACK
 	select SAMSUNG_ATAGS
 	select SAMSUNG_CLKSRC
 	select SAMSUNG_GPIOLIB_4BIT
+	select SAMSUNG_WAKEMASK
 	select SAMSUNG_WDT_RESET
 	select USB_ARCH_HAS_OHCI
 	help

arch/arm/mach-s3c64xx/Kconfig

@@ -5,17 +5,6 @@
 
 if ARCH_S3C64XX
 
-# temporary until we can eliminate all drivers using it.
-config PLAT_S3C64XX
-	bool
-	depends on ARCH_S3C64XX
-	default y
-	select PM_GENERIC_DOMAINS
-	select SAMSUNG_WAKEMASK
-	help
-	  Base platform code for any Samsung S3C64XX device
-
-
 # Configuration options for the S3C6410 CPU
 
 config CPU_S3C6400