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

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https://hg.mozilla.org/integration/gaia-central/rev/9ec7bef08de0
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #19191 from steveck-chung/emergency-cb-mode-fix

Bug 1007441 - Emergency Callback Mode UI not displaying. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/1217ef01f42a
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 1007441 - Emergency Callback Mode UI not displaying
Bumping manifests a=b2g-bump