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

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https://hg.mozilla.org/integration/gaia-central/rev/eff18c4265f0
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #21829 from justindarc/bug1037880

Bug 1037880 - FM radio should stop sound in speaker mode when I receive ...

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https://hg.mozilla.org/integration/gaia-central/rev/3d7d12c41ecd
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1037880 - FM radio should stop sound in speaker mode when I receive an incoming call
Bumping manifests a=b2g-bump