qcacmn: Initialized pdev id with default value 0xFF

pdev_id is being initialized with 0. Since 0 is valid pdev_id, though
pdev is not present for that id, it is being accessed.

Initialized pdev_id to 0xFF by default. Added checks on API to
detect valid pdev_id value corresponding to lmac_id

Change-Id: I2b2a38783615494ccc08e265702815f7e562214b

wlan_cfg/wlan_cfg.c

@@ -725,9 +725,9 @@ int wlan_cfg_get_target_pdev_id(struct wlan_cfg_dp_soc_ctxt *cfg,
 void wlan_cfg_set_pdev_idx(struct wlan_cfg_dp_soc_ctxt *cfg, int pdev_idx,
 			   int hw_macid)
 {
-	qdf_assert_always(pdev_idx < MAX_PDEV_CNT);
+	qdf_assert_always((pdev_idx < MAX_PDEV_CNT) ||
+			  (pdev_idx == INVALID_PDEV_ID));
 	qdf_assert_always(hw_macid < MAX_NUM_LMAC_HW);
-
 	cfg->hw_macid_pdev_id_map[hw_macid] = pdev_idx;
 }