wcn36xx: set PREASSOC and IDLE stated when BSS info changes

When a BSSID is joined, set the link status to 'preassoc', and set it to
'idle' when the BSS is deleted.

This is what the downstream driver is doing, and it seems to improve the
reliability during connect/disconnect stress tests.
Signed-off-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/wcn36xx/main.c

@@ -798,6 +798,8 @@ static void wcn36xx_bss_info_changed(struct ieee80211_hw *hw,
 		if (!is_zero_ether_addr(bss_conf->bssid)) {
 			vif_priv->is_joining = true;
 			vif_priv->bss_index = WCN36XX_HAL_BSS_INVALID_IDX;
+			wcn36xx_smd_set_link_st(wcn, bss_conf->bssid, vif->addr,
+						WCN36XX_HAL_LINK_PREASSOC_STATE);
 			wcn36xx_smd_join(wcn, bss_conf->bssid,
 					 vif->addr, WCN36XX_HW_CHANNEL(wcn));
 			wcn36xx_smd_config_bss(wcn, vif, NULL,
@@ -805,6 +807,8 @@ static void wcn36xx_bss_info_changed(struct ieee80211_hw *hw,
 		} else {
 			vif_priv->is_joining = false;
 			wcn36xx_smd_delete_bss(wcn, vif);
+			wcn36xx_smd_set_link_st(wcn, bss_conf->bssid, vif->addr,
+						WCN36XX_HAL_LINK_IDLE_STATE);
 			vif_priv->encrypt_type = WCN36XX_HAL_ED_NONE;
 		}
 	}