qcacld-3.0: Calculate supported rates according to different case

Fix the regression issue introduced by change
"Change-Id: Ica336398865a8b5e16297e4555dbb7de5e79567e".
The issue is that it will always include driver default rates.

In some case it only needs to calculate supported rates from hostapd.conf
file. Define ini item gChanSwitchHostapdRateEnabled to configure supported
rates calculated from hostapd.conf file or driver default rates when doing
SAP channel switch.

Change-Id: I45eeea5134dd80929bdd1f61246bdc66e1857e22
CRs-fixed: 2103714

core/sme/inc/csr_api.h

@@ -1008,6 +1008,7 @@ typedef struct tagCsrRoamProfile {
 	bool fils_connection;
 	struct cds_fils_connection_info *fils_con_info;
 #endif
+	bool chan_switch_hostapd_rate_enabled;
 } tCsrRoamProfile;
 
 #ifdef FEATURE_WLAN_MCC_TO_SCC_SWITCH