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

========

https://hg.mozilla.org/integration/gaia-central/rev/ded75a877600
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #13731 from MBRSL/bug-933617-lcd

Bug 933617 - [UITest][HW test] prevent CPU sleeping when turning off scr..., r=gasolin

========

https://hg.mozilla.org/integration/gaia-central/rev/0fcfb6a792cc
Author: Tom Jao <tjao@mozilla.com>
Desc: Bug 933617 - [UITest][HW test] prevent CPU sleeping when turning off screen