qcacmn: Create QDF timer multiplier get/set APIs

In order to provide greater flexibility on emulation platforms, replace
the current hard-coded QDF_TIMER_MULTIPLIER with a pair of get/set
methods, configurable at runtime.

Change-Id: I0757da6c2129db08459411eaef75b6183f1aa557
CRs-Fixed: 2049309

qdf/inc/qdf_mc_timer.h

@@ -285,4 +285,20 @@ void qdf_timer_module_deinit(void);
  */
 void qdf_get_time_of_the_day_in_hr_min_sec_usec(char *tbuf, int len);
 void qdf_register_mc_timer_callback(void (*callback) (unsigned long data));
+
+/**
+ * qdf_timer_set_multiplier() - set the global QDF timer scalar value
+ * @multiplier: the scalar value to apply
+ *
+ * Return: None
+ */
+void qdf_timer_set_multiplier(uint32_t multiplier);
+
+/**
+ * qdf_timer_get_multiplier() - get the global QDF timer scalar value
+ *
+ * Return: the global QDF timer scalar value
+ */
+uint32_t qdf_timer_get_multiplier(void);
+
 #endif /* __QDF_MC_TIMER_H */