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

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https://hg.mozilla.org/integration/gaia-central/rev/32ac0bda8e19
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #16981 from ian-liu/settings/bug943825_mount/unmount_sdcard

Bug 943825 - [Gaia] Mount/Unmount SD card, r=@alive, arthur

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https://hg.mozilla.org/integration/gaia-central/rev/0ecca91e899c
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 943825 - [Gaia] Mount/Unmount SD card
Bumping manifests a=b2g-bump