spi: Enable SPI driver for S5P6440 and S5P6450

This patch enables the existing S3C64XX series SPI driver for S5P64X0
and removed dependency on EXPERIMENTAL because we don't need it now.

v3: Changed dependency of S3C64XX_DMA
v2: Removed dependency on EXPERIMENTAL
Signed-off-by: NAbhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: NSangbeom Kim <sbkim73@samsung.com>
Acked-by: NJassi Brar <jassi.brar@samsung.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

drivers/spi/Kconfig

@@ -310,8 +310,8 @@ config SPI_S3C24XX_GPIO
 
 config SPI_S3C64XX
 	tristate "Samsung S3C64XX series type SPI"
-	depends on ARCH_S3C64XX && EXPERIMENTAL
-	select S3C64XX_DMA
+	depends on (ARCH_S3C64XX || ARCH_S5P64X0)
+	select S3C64XX_DMA if ARCH_S3C64XX
 	help
 	  SPI driver for Samsung S3C64XX and newer SoCs.