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

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https://hg.mozilla.org/integration/gaia-2_0/rev/c864083e0e18
Author: Guilherme Goncalves <guilherme.p.gonc@gmail.com>
Desc: Merge pull request #22000 from guilherme-pg/bug1041591-can-disable-logout

Bug 1041591 - Don't set 'findmydevice.can-disable' if not registered on ...

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https://hg.mozilla.org/integration/gaia-2_0/rev/afa45d15da68
Author: Kyle Huey <khuey@kylehuey.com>
Desc: Merge pull request #21957 from khuey/willReadFrequently

Bug 1041112: Add willReadFrequently to grid_icon_renderer to avoid hitti.... r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_0/rev/c7d5b2cbefa0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21914 from KevinGrandon/bug_1040686_homescreen_settings

Bug 1040686 - [Homescreen] Remove column settings section
Conflicts:
	apps/settings/elements/homescreen.html

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https://hg.mozilla.org/integration/gaia-2_0/rev/b352320901b1
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #21862 from lodr/bug-1039984-smartcollections-and-homescreen

Bug 1039984 - [System] Trying to open a smartcollection after killing th...

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https://hg.mozilla.org/integration/gaia-2_0/rev/6c2a7e222792
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Merge pull request #21934 from acperez/bug-1040700

Bug 1040700 - Modify APN for ATT because last update doesn't work as expected. r=jaoo

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https://hg.mozilla.org/integration/gaia-2_0/rev/10f64bbb6211
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #21955 from arcturus/bug-1038414

Bug 1038414 - [B2G][Contacts][Camera][273MB Flame] Camera app OOMs when adding picture to contact r=jmcf

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https://hg.mozilla.org/integration/gaia-2_0/rev/e0ed449e761b
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #21824 from mcjimenez/bug1039222

Bug 1039222 - [SingleVariant] Removed maximum MMS size customization (r =jmcanterafonseca)
Bumping manifests a=b2g-bump