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

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https://hg.mozilla.org/integration/gaia-central/rev/ded75a877600
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #13731 from MBRSL/bug-933617-lcd

Bug 933617 - [UITest][HW test] prevent CPU sleeping when turning off scr..., r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/0fcfb6a792cc
Author: Tom Jao <tjao@mozilla.com>
Desc: Bug 933617 - [UITest][HW test] prevent CPU sleeping when turning off screen

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "fcb4b4cde8285b3a9b79cde0f86fc4934ad4172c", 
+    "revision": "ded75a8776000ba169a76d66265e10f876d1445e", 
     "repo_path": "/integration/gaia-central"
 }