Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/a0b4f5cf54c8
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #11475 from cctuan/903913

Bug 903913 - [Flatfish]Need script to detect device type for reuse in shared folder

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https://hg.mozilla.org/integration/gaia-central/rev/3d2e7e418c7e
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 903913 - [Flatfish]Need script to detect device type for reuse in shared folder