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

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https://hg.mozilla.org/integration/gaia-central/rev/64cc57b5a051
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #17697 from dmarcos/bug988287

Bug 988287 - [CAMERA][MADAI] HUD is receiving click events when it is in...

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https://hg.mozilla.org/integration/gaia-central/rev/499681502671
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 988287 - [CAMERA][MADAI] HUD is receiving click events when it is invisible state
Bumping manifests a=b2g-bump