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

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https://hg.mozilla.org/integration/gaia-central/rev/528c30c112fa
Author: Trif Andrei-Alin <trifandreialin@gmail.com>
Desc: Merge pull request #15257 from bebef1987/unxfail_cam

Bug 959173 - Enable test_unlock_to_camera_with_passcode

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https://hg.mozilla.org/integration/gaia-central/rev/afadd91e89b5
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 959173 - Enable test_unlock_to_camera_with_passcode

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "b9baa6447fd70cafe57988e66d2b62404b2ebe33", 
+    "revision": "528c30c112fa08106deed7e395a511dcbddcbd3c", 
     "repo_path": "/integration/gaia-central"
 }