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

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https://hg.mozilla.org/integration/gaia-1_4/rev/def44e51cf67
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #18315 from davidflanagan/bug995432-v1.4

Merge pull request #18314 from davidflanagan/bug995432

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https://hg.mozilla.org/integration/gaia-1_4/rev/93327b3363b2
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(cherry picked from commit 35ed2ac8d17d373d5e34037bb24e60686561fa84)
Bumping manifests a=b2g-bump