Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/1d378915175b
Author: Zac <zcampbell@mozilla.com>
Desc: Revert "Bug 1038065 - [v2.1] Xfail test_MMI.py because of Bug 1020166"

This reverts commit 22353c951e35ed30007418c7a3e7c8286b97ceb3.

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https://hg.mozilla.org/integration/gaia-central/rev/48edacea5224
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #21567 from cctuan/1035453

Bug 1035453 - [B2G][Camera] Pressing home does not function in the lockscreen camera with passcode lock enabled

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https://hg.mozilla.org/integration/gaia-central/rev/b6a9e6f66d0d
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1035453 - [B2G][Camera] Pressing home does not function in the lockscreen camera with passcode lock enabled
Bumping manifests a=b2g-bump