Make MtpService fill in MTP 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: I475b168c3fbb9dec00761ea9a08c2443cfc392b7
1 file changed