The type of mcc and mnc is String instead of Int now. They should be an
empty string if unknown. Also added a test case for their values.
Bug: 111703979
Test: Vts
Change-Id: Ie0426453dc426ccc6cf203b315806e78511ce14d
Any fixed integer can be returned by vendor's APIs response.
Ideally it should be a random value for testing a vendor library.
Applying this to all the unit tests serial number.
Bug: 38499889
Test: adb shell data/local/tmp/VtsHalRadioV1_0TargetTest
Change-Id: I491db829cca607fad9f6a21987de92269d115253