ARM: ux500: don't select CPUFREQ_DT

The new 'select CPUFREQ_DT' statement causes a warning in some
configurations:

warning: (ARCH_U8500) selects CPUFREQ_DT which has unmet direct dependencies (CPU_FREQ && HAVE_CLK && OF && (!CPU_THERMAL || THERMAL))

No other platform does this, so I think for consistency it's
best if we remove it again from ux500 and instead add the driver
to the defconfig.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/arm/mach-ux500/Kconfig

@@ -9,7 +9,6 @@ menuconfig ARCH_U8500
 	select ARM_GIC
 	select CACHE_L2X0
 	select CLKSRC_NOMADIK_MTU
-	select CPUFREQ_DT
 	select GPIOLIB
 	select HAVE_ARM_SCU if SMP
 	select HAVE_ARM_TWD if SMP