cpufreq: exynos: Remove unselectable rule for arm-exynos-cpufreq.o

Commit 966f2a71 ("cpufreq: exynos: remove Exynos4x12 specific
cpufreq driver support") deleted option ARM_EXYNOS_CPUFREQ but missed
to delete a rule in drivers/cpufreq/Makefile which depends on that
option.

Remove unselectable rule for arm-exynos-cpufreq.o
from drivers/cpufreq/Makefile.
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

drivers/cpufreq/Makefile

@@ -52,7 +52,6 @@ obj-$(CONFIG_ARM_DT_BL_CPUFREQ)		+= arm_big_little_dt.o
 
 obj-$(CONFIG_ARCH_DAVINCI)		+= davinci-cpufreq.o
 obj-$(CONFIG_UX500_SOC_DB8500)		+= dbx500-cpufreq.o
-obj-$(CONFIG_ARM_EXYNOS_CPUFREQ)	+= arm-exynos-cpufreq.o
 obj-$(CONFIG_ARM_EXYNOS5440_CPUFREQ)	+= exynos5440-cpufreq.o
 obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ)	+= highbank-cpufreq.o
 obj-$(CONFIG_ARM_HISI_ACPU_CPUFREQ)	+= hisi-acpu-cpufreq.o