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

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https://hg.mozilla.org/integration/gaia-central/rev/e54e18491c9b
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #15760 from crh0716/943227

Bug 943227 - Stop using emergencyCallsOnly attribute r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/65a29a1d624d
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 943227 - Stop using emergencyCallsOnly attribute
Bumping manifests a=b2g-bump