ARM: realview: use "depends on" instead of "if" after prompt

This platform recently moved to multi-platform, so missed the global
fixup by commit e3246542 ("ARM: use "depends on" for SoC configs
instead of "if" after prompt").  Fix it now.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>

arch/arm/mach-realview/Kconfig

 menuconfig ARCH_REALVIEW
-	bool "ARM Ltd. RealView family" if ARCH_MULTI_V5 || ARCH_MULTI_V6 || ARCH_MULTI_V7
+	bool "ARM Ltd. RealView family"
+	depends on ARCH_MULTI_V5 || ARCH_MULTI_V6 || ARCH_MULTI_V7
 	select ARM_AMBA
 	select ARM_TIMER_SP804
 	select COMMON_CLK_VERSATILE