Revert "[CPUFREQ] constify cpufreq_driver where possible."

This reverts commit aeeddc1435c37fa3fc844f31d39c185b08de4158, which was
half-baked and broken.  It just resulted in compile errors, since
cpufreq_register_driver() still changes the 'driver_data' by setting
bits in the flags field.  So claiming it is 'const' _really_ doesn't
work.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index a12d6a2..f52facc 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1752,7 +1752,7 @@
  * (and isn't unregistered in the meantime).
  *
  */
-int cpufreq_register_driver(const struct cpufreq_driver *driver_data)
+int cpufreq_register_driver(struct cpufreq_driver *driver_data)
 {
 	unsigned long flags;
 	int ret;
@@ -1817,7 +1817,7 @@
  * Returns zero if successful, and -EINVAL if the cpufreq_driver is
  * currently not initialised.
  */
-int cpufreq_unregister_driver(const struct cpufreq_driver *driver)
+int cpufreq_unregister_driver(struct cpufreq_driver *driver)
 {
 	unsigned long flags;