[infra] Add wildcard OWNERS

This is a requirement to enforce code review.

Bug: skia:12124
Change-Id: Ia35c5fec148329625daaffecec60116c291633ed
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/443636
Reviewed-by: Ravi Mistry <rmistry@google.com>
(cherry picked from commit e5d07787f0f141c02f842e455ea653764faef637)
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/446237
Owners-Override: Ravi Mistry <rmistry@google.com>