Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/67f55b80d8d8
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #16327 from mcav/vibrate

Bug 971162 - [B2G][Clock][Alarm] Clock alarm has vibration when alarm vi...

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https://hg.mozilla.org/integration/gaia-central/rev/a2a7aa107f42
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 971162 - [B2G][Clock][Alarm] Clock alarm has vibration when alarm vibration is set to off. r=gaye
Bumping manifests a=b2g-bump