Make users of MtpServer provide DeviceInfo fields

This is part of weaning apps off accessing system identifiers via
system properties API. Apps should use android.os.Build API instead.

Bug: 33700679
Test: Enable MTP mode then check that mtp-detect output same as before this commit
Change-Id: Ic21da7b8e976aaa1abc606a3cb4a1f2bd8698408
2 files changed