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

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https://hg.mozilla.org/integration/gaia-central/rev/828fdfa8f465
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #12302 from KevinGrandon/bug_918122_fix_contacts

Revert "Bug 911696 - [Dialer] [Flatfish] hide dialer app in homescreen if no telephony support" r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/654907243f6a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 911696 - [Dialer] [Flatfish] hide dialer app in homescreen if no telephony support"

This reverts commit 4cfe3660a8f293f54c111d07fca5cec6089bd32a.