Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ba61658dd6f2
Author: Marshall Culpepper <marshall.law@gmail.com>
Desc: Merge pull request #27286 from marshall/bug1109422_mauChanges

Bug 1109422 - [AUM] Updates to support monthly active users

========

https://hg.mozilla.org/integration/gaia-central/rev/600e432b10d2
Author: Marshall Culpepper <marshall@mozilla.com>
Desc: Bug 1109422 - [AUM] Part 2: Make data sharing opt-out by default in FTU. r=fcampo

========

https://hg.mozilla.org/integration/gaia-central/rev/88036910edfb
Author: Marshall Culpepper <marshall@mozilla.com>
Desc: Bug 1109422 - [AUM] Part 1: Updates to support monthly active users. r=djf

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "189d6b3c4e44cfd28a92ce7dee4e06739f479feb", 
+        "git_revision": "a8ab4a083908ed02950c76eea3c2ccb855b3a7d9", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "32e1a251fe4293ac46545d111bd88868be1595ee", 
+    "revision": "ba61658dd6f245dff2c8944570e7bddff6eefb5d", 
     "repo_path": "integration/gaia-central"
 }