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

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https://hg.mozilla.org/integration/gaia-central/rev/a122b2a0e4e7
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #15208 from dmarcos/bug958590

Bug 958590 - [Camera] Delete obsolete camera configuration script (camer...

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https://hg.mozilla.org/integration/gaia-central/rev/5a3a07e700ec
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 958590 - [Camera] Delete obsolete camera configuration script (camera-configuration.js)