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

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https://hg.mozilla.org/integration/gaia-2_1/rev/2d2e164475e1
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #25642 from snowmantw/bug1081132-2.1

Bug 1081132 - Possible to get lock screen into landscape mode

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https://hg.mozilla.org/integration/gaia-2_1/rev/c71390ba527a
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1081132 - Possible to get lock screen into landscape mode
Bumping manifests a=b2g-bump