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

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https://hg.mozilla.org/integration/gaia-central/rev/2ae85acdbb87
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #20926 from zacc/bug_1028906

Bug 1028906 - Homescreen permission is implicit - do not attempt to set

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https://hg.mozilla.org/integration/gaia-central/rev/9070e308e8eb
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1028906 - Homescreen permission is implicit - do not attempt to set
Bumping manifests a=b2g-bump