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

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https://hg.mozilla.org/integration/gaia-2_1/rev/5c9f754f637c
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Merge pull request #20619 from gmarty/Bug-1007948-no-multiple-calls"

This reverts commit 8ccac0744848bd3ceaa6aa1c972ae0eb1e9ddc1e, reversing
changes made to c2c92e7be95dd0b65ee44113e1d17592dd0e20c6.
Bumping manifests a=b2g-bump