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

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https://hg.mozilla.org/integration/gaia-central/rev/f742a186ab56
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #18314 from davidflanagan/bug995432

Bug 995432: enable C-AF if the hardware supports it r=jdarcangelo

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https://hg.mozilla.org/integration/gaia-central/rev/371a433daf5f
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 995432: enable C-AF if the hardware supports it
Bumping manifests a=b2g-bump