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

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https://hg.mozilla.org/integration/gaia-central/rev/daf9e93eb581
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #17997 from mikehenrty/bug-988737-clear

Bug 988737 - SMS notifications do not clear when launching SMS app after... r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/6a25ee243e1b
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 988737 - SMS notifications do not clear when launching SMS app after it's been killed
Bumping manifests a=b2g-bump