Build module-info.json in dist

This is needed for test mapping to have module-info.json built out for
device targets so that test harness can do some checks to ensure the
test is properly configured in TEST_MAPPING files.

module-info has alreay depended on droidcore, which will be
built out in the infrastructure.

Verified in a forrest run: https://android-build.googleplex.com/builds/forrest/run/L81000000840964024

Bug: 154931418
Test: m -j droidcore
      m -j module-info
Change-Id: I76b97debe3fbd51c2dc033c91ed9c2eb73cfa8a2