qcacld-3.0: Fix rmmod for runtime pm

Runtime PM should be turned off before the driver is unloaded.

Change-Id: I8746e92931375893708556e77a3d93bfd6266668
CRs-Fixed: 935300
diff --git a/core/hif/inc/hif.h b/core/hif/inc/hif.h
index ec210a9..3ccf9d2 100644
--- a/core/hif/inc/hif.h
+++ b/core/hif/inc/hif.h
@@ -684,6 +684,7 @@
 void hif_runtime_pm_set_state_on(void);
 
 void hif_enable_power_management(void *hif_ctx);
+void hif_disable_power_management(void *hif_ctx);
 int hif_runtime_suspend(void);
 int hif_runtime_resume(void);
 int hif_bus_resume(void);