[Android] Add mb config entries for chromium bots on chromium.android.
[Android] Add mb config entries for chromium bots on chromium.android.

i.e., this does not include the cronet or webview bots.

BUG=580129

Review URL: https://codereview.chromium.org/1615053002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#370761}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk