ARM: EXYNOS: Make ARCH_EXYNOS select USE_OF

Since EXYNOS is now DT-only, it always requires USE_OF option to be
selected. This patch moves USE_OF selection from entries of DT board
files to ARCH_EXYNOS.
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/Kconfig

@@ -796,6 +796,7 @@ config ARCH_EXYNOS
 	select HAVE_S3C_RTC if RTC_CLASS
 	select NEED_MACH_GPIO_H
 	select NEED_MACH_MEMORY_H
+	select USE_OF
 	help
 	  Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
 

arch/arm/mach-exynos/Kconfig

@@ -98,7 +98,6 @@ config MACH_EXYNOS4_DT
 	select PINCTRL
 	select PINCTRL_EXYNOS
 	select S5P_DEV_MFC
-	select USE_OF
 	help
 	  Machine support for Samsung Exynos4 machine with device tree enabled.
 	  Select this if a fdt blob is available for the Exynos4 SoC based board.
@@ -111,7 +110,6 @@ config MACH_EXYNOS5_DT
 	depends on ARCH_EXYNOS5
 	select ARM_AMBA
 	select CLKSRC_OF
-	select USE_OF
 	help
 	  Machine support for Samsung EXYNOS5 machine with device tree enabled.
 	  Select this if a fdt blob is available for the EXYNOS5 SoC based board.