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

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https://hg.mozilla.org/integration/gaia-central/rev/89607d2e16d8
Author: Sean Lee <weilonge@gmail.com>
Desc: Merge pull request #26667 from weilonge/seanlee/STK/master/Bug1088611

Bug 1088611 - Fix SET UP EVENT for mt-call, connected and disconnected. r=frsela

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https://hg.mozilla.org/integration/gaia-central/rev/7b3fc0b6e64f
Author: Sean Lee <weilonge@gmail.com>
Desc: Bug 1088611 -
1. Fix SET UP EVENT for mt-call, connected and disconnected.
2. Give a shorter time for activity event.
Bumping manifests a=b2g-bump