ANDROID: cpuidle: export cpuidle_driver_state_disabled

Export cpuidle_driver_state_disabled() so that CPU idle states may be
disabled at runtime for debugging CPU and cluster idle states.

Bug: 175718935
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
Change-Id: Id9038074d64fb6c0444d9aca68420414c3223e93
(cherry picked from commit de93734e22)

drivers/cpuidle/driver.c

@@ -385,3 +385,4 @@ unlock:
 
 	mutex_unlock(&cpuidle_lock);
 }
+EXPORT_SYMBOL_GPL(cpuidle_driver_state_disabled);