Add idmap completely parsed assertion

If LoadedIdmap::Load finishes parsing the idmap file but has not
parsed the entire file, then it parsed the file incorrectly. Log
an error if the idmap fails to parse.

Bug: 174676094
Test: libandroidfw_tests
Change-Id: I8ae7ed525715ab907d5813975c1ef5d1260bbd33
1 file changed