Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ba07da6dd56d
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #22468 from shamenchens/Bug1032282-LockscreenEmergencyCall-3

Bug 1032282 - Lockscreen disable emergency call when no mozTelephony, r=gweng

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https://hg.mozilla.org/integration/gaia-central/rev/9d809567dbde
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1032282 - Lockscreen disable emergency call when no mozTelephony

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https://hg.mozilla.org/integration/gaia-central/rev/c73e42fd79da
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #22403 from shamenchens/Bug1045252-PowerSaverIcon-2

Bug 1045252 - Power saving mode icon, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/0ceaf84c3b0a
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1045252 - Power saving mode icon
Bumping manifests a=b2g-bump