[nrf fromtree] net: wifi: Add disconnection success code

When disconnect request is successful, the status
was taking as WIFI_REASON_DISCONN_UNSPECIFIED only.
Adding WIFI_REASON_DISCONN_SUCCESS which can be help
to determine status of disconnect request. If this status
is failed then reason can be useful.

Signed-off-by: Kapil Bhatt <[email protected]>
(cherry picked from commit cc42d16)
Signed-off-by: Robert Lubos <[email protected]>

Author: kapbh

include/zephyr/net/wifi_mgmt.h

@@ -427,8 +427,10 @@ enum wifi_conn_status {
  * in the disconnect result event for detailed reason.
  */
 enum wifi_disconn_reason {
+	/** Success, overload status as reason */
+	WIFI_REASON_DISCONN_SUCCESS = 0,
 	/** Unspecified reason */
-	WIFI_REASON_DISCONN_UNSPECIFIED = WIFI_STATUS_DISCONN_FIRST_STATUS,
+	WIFI_REASON_DISCONN_UNSPECIFIED,
 	/** Disconnected due to user request */
 	WIFI_REASON_DISCONN_USER_REQUEST,
 	/** Disconnected due to AP leaving */