Add OWNERS in prebuilts/devtools

* Owners are selected from top CL approvals or owners.
  They will be suggested to review/approve future CLs.
* OWNERS files are recognized by the new find-owners plugin, see .md files in
  https://gerrit.googlesource.com/plugins/find-owners/+/master/src/main/resources/Documentation/

Test: build/make/tools/checkowners.py -c -v OWNERS
Change-Id: I052c11888ce69686093b4beca0ef35e11710dfef
1 file changed
tree: c414aa3f8431582f0e76b8be58831b8437c7b835
  1. adt/
  2. notices/
  3. repository/
  4. tools/
  5. OWNERS
  6. update_jars.sh