[config_data] Put files in meta/

Files in config_data are usually small.
Put them in meta/ so they're archived, rather than rounding up to blob
boundaries.

Impact: >3MB saved in one of the product builds. :)

Bug: 37055
Fixed: 37055
Change-Id: Ia5513e5c942dce4ad8a4826931d5804613a4d9af
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/434554
Commit-Queue: Shai Barack <shayba@google.com>
Reviewed-by: Petr Hosek <phosek@google.com>
Reviewed-by: Fady Samuel <fsamuel@google.com>
Testability-Review: Fady Samuel <fsamuel@google.com>