qcacld-3.0: Remove check for DBS HW mode

Currently the driver checks whether hw is
already in DBS in the function
policy_mgr_check_and_set_hw_mode_for_channel_switch
and it does not set hw mode if it is already
in DBS mode. It can happen that SMM is already
requested and is present in serialization and it
would change the HW mode from DBS->SMM and if
driver starts any vdev on 2.4ghz in HST/HSP
which requires the DBS mode for 2.4ghz , the FW
would send a vdev start failure.

Fix is to remove the check of current hw mode and
let DBS be posted to serialization. If hw mode is
already in DBS it would return from serialization
with E_ALREADY but would ensure that HW mode is
always in DBS for a 2.4ghz connection.

Change-Id: Ica660058175cb1edc2931dd2d28ee6cdd9bab2f4
CRs-Fixed: 2823238

components/cmn_services/policy_mgr/src/wlan_policy_mgr_action.c

@@ -2771,11 +2771,6 @@ QDF_STATUS policy_mgr_check_and_set_hw_mode_for_channel_switch(
 	 */
 	policy_mgr_stop_opportunistic_timer(psoc);
 
-	if (policy_mgr_is_current_hwmode_dbs(psoc)) {
-		policy_mgr_debug("Already in DBS mode");
-		return QDF_STATUS_E_ALREADY;
-	}
-
 	if (wlan_reg_freq_to_band(ch_freq) != REG_BAND_2G)
 		return QDF_STATUS_E_NOSUPPORT;