Mark Android R (rvc-dev-plus-aosp-without-vendor@6692709) as merged

Bug: 166295507
Merged-In: I0fa93b2e37c8ac075337cdbdcdaa6bc639c2ae5a
Change-Id: I889f8df6f4f726cef7f2b3a15b73bbb20525ea85
tree: 5cbf68e6094fd128decd453d216935e4d6be0f74
  1. bootstrap/
  2. darwin-x86/
  3. linux-x86/
  4. Android.bp
  5. OWNERS