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

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https://hg.mozilla.org/integration/gaia-central/rev/b90f17ae773f
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #23018 from yurenju/b2g-desktop

Bug 1002545 - Switching to b2g desktop builds r=@yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/b2c0005210e8
Author: Martin Thomson <martin.thomson@gmail.com>
Desc: Bug 1002545 - Switching to b2g desktop builds
Bumping manifests a=b2g-bump