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

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https://hg.mozilla.org/integration/gaia-central/rev/0757f1a86ada
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Merge pull request #12710 from fcampo/ftu-doneButton-824929

Bug 824929 - [SIM screen] The Done key is always active and can be pressed before the PIN Code is introduced (r=jmcf)

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https://hg.mozilla.org/integration/gaia-central/rev/6787b9c39fcc
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 824929 - [SIM screen] The Done key is always active and can be pressed before the PIN Code is introduced

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "475430d6ad52321b5ea878689a1547407089ecd8", 
+    "revision": "0757f1a86adab017411c875060d11a59208f04c9", 
     "repo_path": "/integration/gaia-central"
 }