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

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https://hg.mozilla.org/integration/gaia-central/rev/326d3bcf1868
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #16166 from yurenju/comm-makefile

Bug 968675 - Add Makefile for communications r=@timdream

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https://hg.mozilla.org/integration/gaia-central/rev/d90552ecba05
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 968675 - Add Makefile for communications
Bumping manifests a=b2g-bump