qcacmn: Call channel change callback in regulatory_pdev_open

During pdev create callback, pdev reference cannot be taken. Hence,
channel change callbacks cannot be called during pdev create. So
call the callbacks during regulatory_pdev_open. Also dont check
if regulatory_pdev_open fails.

Change-Id: I9d444f952418be983e4ac2182581d03bba02b198
CRs-Fixed: 2572487

umac/regulatory/dispatcher/inc/wlan_reg_services_api.h

@@ -632,6 +632,14 @@ QDF_STATUS regulatory_psoc_open(struct wlan_objmgr_psoc *psoc);
  */
 QDF_STATUS regulatory_psoc_close(struct wlan_objmgr_psoc *psoc);
 
+/**
+ * regulatory_pdev_open() - Open regulatory component
+ * @pdev: Pointer to pdev structure
+ *
+ * Return: Success or Failure
+ */
+QDF_STATUS regulatory_pdev_open(struct wlan_objmgr_pdev *pdev);
+
 /**
  * regulatory_pdev_close() - Close regulatory component
  * @pdev: Pointer to pdev structure.