qcacmn: Fix -Wmissing-prototypes in QDF

We want to enable the compiler's -Wmissing-prototypes switch, but
there is existing code that is generating warnings. Fix all warnings
in qdf.

Change-Id: Ib499e7d0a5bfb6d2e5a7eaa7fbe769bb2b49772a
CRs-Fixed: 1076314

qdf/inc/qdf_mc_timer.h

@@ -249,4 +249,22 @@ unsigned long qdf_mc_timer_get_system_ticks(void);
  */
 unsigned long qdf_mc_timer_get_system_time(void);
 
+/**
+ * qdf_timer_module_init() - initializes a QDF timer module.
+ *
+ * This API initializes the QDF timer module. This needs to be called
+ * exactly once prior to using any QDF timers.
+ *
+ * Return: none
+ */
+void qdf_timer_module_init(void);
+
+/**
+ * qdf_timer_module_deinit() - Deinitializes a QDF timer module.
+ *
+ * This API deinitializes the QDF timer module.
+ * Return: none
+ */
+void qdf_timer_module_deinit(void);
+
 #endif /* __QDF_MC_TIMER_H */