qcacmn: Fix type for wlan_serialization_cmd_callback

Fix the type for nan_serialized_cb and remove unnecessary
type casts from other callbacks.

Change-Id: Ie4e45f5a7e9fc17eb1c45fa18160e3bbd47151fe
CRs-Fixed: 2402989

umac/scan/core/src/wlan_scan_manager.c

@@ -999,8 +999,7 @@ scm_scan_start_req(struct scheduler_msg *msg)
 
 	cmd.cmd_type = WLAN_SER_CMD_SCAN;
 	cmd.cmd_id = req->scan_req.scan_id;
-	cmd.cmd_cb = (wlan_serialization_cmd_callback)
-		scm_scan_serialize_callback;
+	cmd.cmd_cb = scm_scan_serialize_callback;
 	cmd.umac_cmd = req;
 	cmd.source = WLAN_UMAC_COMP_SCAN;
 	cmd.is_high_priority = false;