Fix stop Ble scan logic

Can not simplly stop ble scan if one of the device is not connected yet.
We also need to check if any devices has been already reported ble
presence since there's a chance CDM need to report `ble disappeared`

After device is bt disconnected,  wait for 10 seconds, if a device
pending to report BLE device lost and also it was BLE presence before,
it is likely the BLE is lost and trigger the onDeviceEvent callback with
EVENT_BLE_DISAPPEARED event.

Bug: 326652934
Test: cts
Change-Id: I5c75647284cc877f7d53e29d899788842c696398