Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/7157a0e8c07a
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #24117 from nullaus/bug1064975

bug 1064975 - Manually check evt.detail for evt.detail.filter instead of...

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https://hg.mozilla.org/integration/gaia-2_1/rev/9cf44cd39368
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1064975 - Manually check evt.detail for evt.detail.filter instead of short-hand assignment. r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_1/rev/f8b1a0b41efa
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1063305 - NFC icon disappear after reboot

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https://hg.mozilla.org/integration/gaia-2_1/rev/fd1e701fef6f
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1063740 - Home screen is shown in landscape mode when canceling out of search app. r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_1/rev/32f552d5ca4b
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 1060727 - [CMAS] Duplicated notifications in system tray when dismiss the attention screen by tapping on home button
Bumping manifests a=b2g-bump