ARM: vexpress: Don't select VEXPRESS_CONFIG

CONFIG_VEXPRESS_CONFIG has 'default y if ARCH_VEXPRESS', so selecting is
unnecessary. Selecting it also prevents setting CONFIG_VEXPRESS_CONFIG
to a module.

Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>

arch/arm/mach-vexpress/Kconfig

@@ -19,7 +19,6 @@ menuconfig ARCH_VEXPRESS
 	select POWER_SUPPLY
 	select REGULATOR if MMC_ARMMMCI
 	select REGULATOR_FIXED_VOLTAGE if REGULATOR
-	select VEXPRESS_CONFIG
 	help
 	  This option enables support for systems using Cortex processor based
 	  ARM core and logic (FPGA) tiles on the Versatile Express motherboard,