android: Add emulator avd specific OWNERS files

Bug: 922145
Change-Id: Ica6b8f94bf47b7c10dadad6e6ecdddf31b14166c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2146060Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#758894}

build/android/pylib/local/emulator/OWNERS

+bpastene@chromium.org
+hypan@google.com
+jbudorick@chromium.org
+liaoyuke@chromium.org

tools/android/avd/OWNERS

+file://build/android/pylib/local/emulator/OWNERS