ARM: keystone: remove redundant depends on ARM_PATCH_PHYS_VIRT

KeyStone is Multi-platform.  ARM_PATCH_PHYS_VIRT is already select'ed
by ARCH_MULTIPLATFORM.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>

arch/arm/mach-keystone/Kconfig

 config ARCH_KEYSTONE
 	bool "Texas Instruments Keystone Devices"
 	depends on ARCH_MULTI_V7
-	depends on ARM_PATCH_PHYS_VIRT
 	select ARM_GIC
 	select HAVE_ARM_ARCH_TIMER
 	select CLKSRC_MMIO