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

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https://hg.mozilla.org/integration/gaia-central/rev/1bb9d5ab6f4f
Author: DouglasSherk <github@sherk.me>
Desc: Revert "Bug 980982 - [DSDS] Cache ril.xxx.defaultServiceId in MSAB to avoid IO thrashing. r=rik"

This reverts commit 2709783b5a4d2f338c583ee66081d00033e4fd50.

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https://hg.mozilla.org/integration/gaia-central/rev/31ebb69556da
Author: DouglasSherk <github@sherk.me>
Desc: Revert "Bug 985888 - [DSDS] Display currently in-use SIM cards on call buttons. r=rik"

This reverts commit 6ac53288eeaeb34013f39a98762948a481481cf1.
Bumping manifests a=b2g-bump