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

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https://hg.mozilla.org/integration/gaia-central/rev/13473401780f
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #29670 from mwargers/1153320

Bug 1153320 - Fix intermittent test_dialer_clear_miss_call_notification.py failure

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https://hg.mozilla.org/integration/gaia-central/rev/29025916af8f
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1153320 - Fix intermittent test_dialer_clear_miss_call_notification.py failure

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https://hg.mozilla.org/integration/gaia-central/rev/dc6c16168810
Author: No-Jun Park <npark@mozilla.com>
Desc: Merge pull request #29601 from npark-mozilla/1156445

Bug 1156445 - Add check to see the device display is turned on

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https://hg.mozilla.org/integration/gaia-central/rev/21c99fe8e2f5
Author: No-Jun Park <npark@mozilla.com>
Desc: Bug 1156445 - Add check to see the device display is turned on

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "ee4941acf3f4b544aa89871cb46ff306e488c493", 
+        "git_revision": "6c0aaee952f966dfc16f85e2d344de472c3278cb", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "60c836d195e864bb6e1a94bb522d4e31151a01f4", 
+    "revision": "13473401780f67a8ea056866520420a534055928", 
     "repo_path": "integration/gaia-central"
 }