[CPUFREQ] Move kernel/cpufreq.c to drivers/cpufreq/cpufreq.c

Also remove $Id$ tag.
No other code change.

drivers/cpufreq/Makefile

+# CPUfreq core
+obj-$(CONFIG_CPU_FREQ)			+= cpufreq.o
+
 # CPUfreq governors 
 obj-$(CONFIG_CPU_FREQ_GOV_USERSPACE)	+= userspace.o
 

kernel/Makefile

@@ -15,7 +15,6 @@ obj-$(CONFIG_UID16) += uid16.o
 obj-$(CONFIG_MODULES) += ksyms.o module.o
 obj-$(CONFIG_KALLSYMS) += kallsyms.o
 obj-$(CONFIG_PM) += power/
-obj-$(CONFIG_CPU_FREQ) += cpufreq.o
 obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
 obj-$(CONFIG_COMPAT) += compat.o
 obj-$(CONFIG_IKCONFIG) += configs.o