qcacmn: Fix compilation error caused by hif_disable_power_management

hif_disable_power_management is only defiend for PCI devices which is
causing compilation error for SNOC devices. Define empty definition of
hif_disable_power_management for SNOC devices.

Change-Id: I4da5e2346119626fd6478d3eb835bcb1ba9dd663
CRs-Fixed: 978810

hif/src/snoc/if_snoc.c

@@ -290,8 +290,17 @@ void hif_snoc_irq_disable(struct hif_softc *scn, int ce_id)
  * hif_enable_power_management(): enable power management
  * @hif_ctx: hif context
  *
- * Dummy place holder implementation for SNOC
  */
 void hif_enable_power_management(void *hif_ctx)
 {
 }
+
+/**
+ * hif_disable_power_management(): disable power management
+ * @hif_ctx: hif context
+ *
+ * Dummy place holder implementation for SNOC
+ */
+void hif_disable_power_management(void *hif_ctx)
+{
+}