[CPUFREQ] Move ARM Samsung cpufreq drivers to drivers/cpufreq/

According to discussion of the ARM arch subsystem migration,
ARM cpufreq drivers move to drivers/cpufreq. So this patch
adds Kconfig.arm for ARM like x86 and adds Samsung S5PV210
and EXYNOS4210 cpufreq driver compile in there.
As a note, otherw will be moved.

Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Dave Jones <davej@redhat.com>
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index 9fb8485..e898215 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -184,5 +184,10 @@
 source "drivers/cpufreq/Kconfig.x86"
 endmenu
 
+menu "ARM CPU frequency scaling drivers"
+depends on ARM
+source "drivers/cpufreq/Kconfig.arm"
+endmenu
+
 endif
 endmenu