ARM: multi_v7_defconfig: Remove unused Kconfig option MACH_UX500_DT

Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/configs/multi_v7_defconfig

@@ -105,7 +105,6 @@ CONFIG_ARCH_UNIPHIER=y
 CONFIG_ARCH_U8500=y
 CONFIG_MACH_HREFV60=y
 CONFIG_MACH_SNOWBALL=y
-CONFIG_MACH_UX500_DT=y
 CONFIG_ARCH_VEXPRESS=y
 CONFIG_ARCH_VEXPRESS_CA9X4=y
 CONFIG_ARCH_VEXPRESS_TC2_PM=y