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

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https://hg.mozilla.org/integration/gaia-central/rev/6c15bf65a1be
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #33929 from gasolin/issue-1236781

Bug 1236781 - move 'Connect with WPS' to Advanced settings section, r=scott

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https://hg.mozilla.org/integration/gaia-central/rev/b315b7e917f3
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1236781 - move 'Connect with WPS' to Advanced settings section, r=scott

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "df0aecb629da56c44c465e2d8348a7c285f1a3ac", 
+        "git_revision": "847f3cbc8d72b03c75c96cd59e208bbce291a115", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "8dd58c096d55a6a2f6fdcb61e93a07fa9ce7c340", 
+    "revision": "6c15bf65a1bece5f3470916b3e72580860c46939", 
     "repo_path": "integration/gaia-central"
 }