Bumping gaia.json for 7 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/f15860edcc65
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: [Bug 1055270] [KK Only][Flame][Camera] Face detection coordinates are inverted

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https://hg.mozilla.org/integration/gaia-2_1/rev/47ccd3354962
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1071882 - [SystemBrowser] Landing page should navigate to URL r=alive

Conflicts:
	apps/system/test/marionette/lib/system.js

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https://hg.mozilla.org/integration/gaia-2_1/rev/7b4886806d86
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1073216 - cancel fullscreen when attention opening

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https://hg.mozilla.org/integration/gaia-2_1/rev/3e2bfda2fcd3
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1074028 - Overlapping rocketbar and statusbar icons for 3rd party apps

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https://hg.mozilla.org/integration/gaia-2_1/rev/55f7dc2191d0
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 1071235 - Fix touching fullscreen video displaying controls r=alive

CSS background-color in ".appWindow.collapsible .screenshot-overlay"
makes the platform breaking tapping on a fullscreen video. Setting
'visiblity: hidden' when we are fullscreen does workaround the issue.

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https://hg.mozilla.org/integration/gaia-2_1/rev/05866e3d2eb4
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #24363 from EragonJ/v2.1-bug-1068978

Bug 1068978 - [CBS] Migrate all ril.cellbroadcast.disabled setting to mu...

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https://hg.mozilla.org/integration/gaia-2_1/rev/2d1883b64d75
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1068978 - [CBS] Migrate all ril.cellbroadcast.disabled setting to multi client format
Bumping manifests a=b2g-bump