qcacld-3.0: Add BTC as a new roam trigger reason in host

To support BTC roaming, add a definition of BTC roam trigger
reason in ini roam_triggers. It goes to fw via roam_enable
trigger command (WMI_ROAM_ENABLE_DISABLE_TRIGGER_REASON_CMDID)

Change-Id: I231a72ed98a74fb1b5ced12da7c3932af12d485d
CRs-Fixed: 3009787

components/mlme/dispatcher/inc/cfg_mlme_lfr.h

@@ -2463,7 +2463,8 @@
  * ROAM_TRIGGER_REASON_ESS_RSSI    BIT 16
  * ROAM_TRIGGER_REASON_WTC_BTM     BIT 17
  * ROAM_TRIGGER_REASON_PMK_TIMEOUT BIT 18
- * ROAM_TRIGGER_REASON_MAX         BIT 19
+ * ROAM_TRIGGER_REASON_BTC         BIT 19
+ * ROAM_TRIGGER_REASON_MAX         BIT 20
  *
  * Related: none
  *