backport group files for media OWNERS references

media OWNERS files point to these to simplify membership updates as
our team changes. Backporting these simplifies our OWNERS management
in older CTS releases.

Bug: 227689634
Test: repo upload
Merged-In: I840068aa1ba5ea3b19b855347d45221875b773e9
Merged-In: Ie3cf7ca7ee46a1c3b783047a1385d9ffa57ebc09
Change-Id: I40d9f57b314089c64bdaec94ee4de143fafa3389