Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5508e8211527
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #17791 from snowmantw/issue937442-lockscreen-window

Bug 937442 - (lockscreen-window) [Window Management] Implement LockscreenWindow to manage LockScreen

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https://hg.mozilla.org/integration/gaia-central/rev/a6c29f897b73
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 937442 - (lockscreen-window) [Window Management] Implement LockscreenWindow to manage LockScreen

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https://hg.mozilla.org/integration/gaia-central/rev/5aece84a5bac
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #17075 from sergi/981989

Bug 981989 - [DSDS] Fixed dialing numbers page is not separated for 2 SIM card, which means that if set SIM 1 to enabled, same page of SIM 2 will become enabled as well even it's disabled in Call settings.

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https://hg.mozilla.org/integration/gaia-central/rev/19a37dadd531
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 981989 - [DSDS] Fixed dialing numbers page is not separated for 2 SIM card, which means that if set SIM 1 to enabled, same page of SIM 2 will become enabled as well even it's disabled in Call settings.

The FDN status was not refreshed in the FDN settings page, so it always would adopt the status of the last card checked for it. This patch adds a check whenever the FDN Settings panel is ready.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "fb82768eafb7c6ba37edc76a5261a993676ec911", 
+    "revision": "5508e821152724e2bafe520b247136cb3f500bfa", 
     "repo_path": "/integration/gaia-central"
 }