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

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https://hg.mozilla.org/integration/gaia-central/rev/54f300232915
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #28117 from viorelaioia/bug_1131559

Bug 1131559 - Xfail test_homescreen_column_layout.py because of Bug 11...

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https://hg.mozilla.org/integration/gaia-central/rev/9da14cd1c90b
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Bug 1131559 - Xfail test_homescreen_column_layout.py because of Bug 1131037

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https://hg.mozilla.org/integration/gaia-central/rev/dee21fddf1f7
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1130742 - merge pull request #28099 from Anindya-Pandey:bugfix to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/2c84103b6c2a
Author: Anindya Pandey <anindyapandey@gmail.com>
Desc: Bug 1130742 - keyboard_test.js will fail if js/layouts contains untracked non-JS file(3) r=timdream

Fix keyboar_test.js

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "17bea27216a9377f6c77ae123fc9b403bdb7a181", 
+        "git_revision": "dc7f9bed1c9424023d1842692297b27138ee456d", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "1bd89c350301fc599a7c930a49d70d05f52e9f7d", 
+    "revision": "54f300232915f9c63d8ba3c4fe5121c9d8281f92", 
     "repo_path": "integration/gaia-central"
 }