[ARM] pxa: remove unused CPU_FREQ_PXA Kconfig symbol

cpufreq drivers for pxa2xx/3xx are now built-in automatically as soon as
CPU_FREQ is enabled.
Signed-off-by: NPhilipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: NEric Miao <eric.miao@marvell.com>

arch/arm/Kconfig

@@ -1169,12 +1169,6 @@ config CPU_FREQ_IMX
 
 	  If in doubt, say N.
 
-config CPU_FREQ_PXA
-	bool
-	depends on CPU_FREQ && ARCH_PXA && PXA25x
-	default y
-	select CPU_FREQ_DEFAULT_GOV_USERSPACE
-
 endif
 
 source "drivers/cpuidle/Kconfig"

arch/arm/configs/viper_defconfig

@@ -298,7 +298,6 @@ CONFIG_CPU_FREQ_GOV_POWERSAVE=m
 CONFIG_CPU_FREQ_GOV_USERSPACE=m
 CONFIG_CPU_FREQ_GOV_ONDEMAND=m
 CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m
-CONFIG_CPU_FREQ_PXA=y
 
 #
 # Floating point emulation