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

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https://hg.mozilla.org/integration/gaia-central/rev/f2c1d7617f86
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #11456 from rexboy7/fix-bug894815

bug 894815 - [lockscreen]permission screen and attention screen height f...

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https://hg.mozilla.org/integration/gaia-central/rev/29b9507be23b
Author: Rex Lee <rexboy@mozilla.com>
Desc: bug 894815 - [lockscreen]permission screen and attention screen height fix on lockscreen camera