qcacld-3.0: [11ABG] Add dot11mode changes to support 11abg

Add new dot11mode in MLME and update the utility functions to
derive the dot11mode based on the INI config and AP dot11 mode.

Change-Id: Ic53ab0cdd94dce75d6928270bc8bf4f8539ac96f
CRs-Fixed: 3653767

components/mlme/dispatcher/inc/wlan_mlme_public_struct.h

@@ -234,6 +234,7 @@ struct mlme_edca_ac_vo {
  * @MLME_DOT11_MODE_11AX_ONLY: vdev just supports 11AX mode
  * @MLME_DOT11_MODE_11BE: vdev supports 11BE mode, and modes above it
  * @MLME_DOT11_MODE_11BE_ONLY: vdev just supports 11BE mode
+ * @MLME_DOT11_MODE_ABG: vdev supports just 11A, 11B and 11G modes
  */
 enum mlme_dot11_mode {
 	MLME_DOT11_MODE_ALL,
@@ -248,7 +249,8 @@ enum mlme_dot11_mode {
 	MLME_DOT11_MODE_11AX,
 	MLME_DOT11_MODE_11AX_ONLY,
 	MLME_DOT11_MODE_11BE,
-	MLME_DOT11_MODE_11BE_ONLY
+	MLME_DOT11_MODE_11BE_ONLY,
+	MLME_DOT11_MODE_ABG
 };
 
 /**