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

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https://hg.mozilla.org/integration/gaia-central/rev/7e3765585e50
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #14301 from crh0716/921390

Bug 921390 - Display operator name for each SIM on the lockscreen of DSDS devices r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/7f4863dad55e
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 921390 - Display operator name for each SIM on the lockscreen of DSDS devices