Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_2r/rev/8d157883d632
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #32422 from yzen/bug-1209062-callscreen-v2.2r

Bug 1209062 - making sure that the phone number is first announced on…r=timdream, a=2.2r+

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https://hg.mozilla.org/integration/gaia-2_2r/rev/bef23eb90013
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1209062 - making sure that the phone number is first announced on callscreen.

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https://hg.mozilla.org/integration/gaia-2_2r/rev/321b44124de8
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #32421 from yzen/bug-1209062-statusbar-v2.2r

Bug 1209062 - adding aria-live to headphone and usb related icons so …. r=timdream, a=2.2r+

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https://hg.mozilla.org/integration/gaia-2_2r/rev/4cc719cc44e2
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1209062 - adding aria-live to headphone and usb related icons so the screen reader announces if they appear.

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https://hg.mozilla.org/integration/gaia-2_2r/rev/5496b0ea332e
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #32423 from yzen/bug-1209062-appchrome-v2.2r

Bug 1209062 - making sure that current app's appChrome, if visible, i…r=timdream, a=2.2r+

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https://hg.mozilla.org/integration/gaia-2_2r/rev/4d96c85e201a
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1209062 - making sure that current app's appChrome, if visible, is owned by the statusbar.