Add checkstyle script to MP PREUPLOAD config

This will enable preupload lint checks on changes made as part of the
commit. This will help catch unused imports, incorrect imports order,
Java doc style error and various other checks. This script is already
being used in cts repo.

Test: n/a
Bug: 225184454
Change-Id: Id3f6b23dce2252b9e50f8d4414a90009907d9100
(cherry picked from commit 9cc0f0a721b268150de299365aad64f28b53fe38)
1 file changed