Use broader permissions when archiving files.

Using broader premissions for archived files allows them to be more
easily used when extracted. For example, defaulting regular files to
0644 will allow other tooling to use a file without the need to change
permissions manually.

Bug: 189919409
Test: m dist and inspected file permissions of archived files
Change-Id: I4a0f8075206391254c639ecf865639bb9e8df0bf