mb_config.pyl: move Linux ARM bot to chromium.fyi
mb_config.pyl: move Linux ARM bot to chromium.fyi

The bot moved waterfall but the mb config was not updated.

R=dpranke

Review URL: https://codereview.chromium.org/1466553002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#360736}

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