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

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https://hg.mozilla.org/integration/gaia-central/rev/c9a56cfb6e03
Author: Sung Chiu <suchiu@mozilla.com>
Desc: Merge pull request #30079 from sean2449/Bug-1160981-EPG-HTML

Bug 1160981 - [Stingray][EPG] Basic HTML UI mockup, r=johnhu

========

https://hg.mozilla.org/integration/gaia-central/rev/92ff01bc789d
Author: Sung Chiu <suchiu@mozilla.com>
Desc: Bug 1160981 - [Stingray][EPG] Basic HTML UI mockup

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "c3f70e419a353a27320db92557a09b7419a85c12", 
+        "git_revision": "9540d75f97353fcff30e37b375e3f680a529ecb6", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "31f2c5ff2afbac17c60970ea7b3031794c493b60", 
+    "revision": "c9a56cfb6e038441d6007bc26833e07b68c689a9", 
     "repo_path": "integration/gaia-central"
 }