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

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https://hg.mozilla.org/integration/gaia-2_0/rev/0f30f94a7155
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #22600 from hfiguiere/v2.0

Bug 1027232 - Wait for the homescreen to be ready a=npotb

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https://hg.mozilla.org/integration/gaia-2_0/rev/0820a6d30607
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1027232 - Wait for the homescreen to be ready
Bumping manifests a=b2g-bump