Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f4f2214a54a7
Author: Bebe <bebe@mozilla.ro>
Desc: Revert "Bug 1014590 - Unxfail test_lockscreen_unlock_to_camera.py"

This reverts commit e89fdd890dc4e8d6713b701e29ea94fdfab7b005.
Bumping manifests a=b2g-bump