Merge changes Ic0b6c00e,I9ef60eeb,I9d1deb1b,I49799870,I95e5d984, ... into main

* changes:
  stack::l2cap [19/19] L2CA_UseLatencyMode
  stack::l2cap [18/19] L2CA_UpdateBleConnParams
  stack::l2cap [17/19] L2CA_SubrateRequest
  stack::l2cap [16/19] L2CA_SetTxPriority
  stack::l2cap [15/19] L2CA_SetIdleTimeoutByBdAddr
  stack::l2cap [14/19] L2CA_SetChnlFlushability
  stack::l2cap [13/19] L2CA_SetAclPriority
  stack::l2cap [12/19] L2CA_SetAclLatency
  stack::l2cap [11/19] L2CA_SendFixedChnlData
  stack::l2cap [10/19] L2CA_RemoveFixedChnl