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

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https://hg.mozilla.org/integration/gaia-central/rev/53e60d8cbcc1
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #16851 from mcav/fix-alarmicon

Bug 978683 - [Clock] Alarm icon not showing in the status bar. r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/aa6dd65ea9a7
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 978683 - [Clock] Alarm icon not showing in the status bar after setting an alarm
Bumping manifests a=b2g-bump