Update VTS tests to use GeranBands P900 and 850 instead

Also call stopNetworkScan to prevent DEVICE_IN_USE error

Test: run vts VtsHalRadioV1_4Target, VtsHalRadioV1_5Target
Bug: 159582104
Change-Id: If27cb00fe9eb5cf3ce2e73107ed6463c1ebb7cfd
6 files changed