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

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https://hg.mozilla.org/integration/gaia-central/rev/c89507489572
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #28862 from dominickuo/bug-1138682

Bug 1138682 - [Camera] remove volume control for notification channel, r=wilsonpage

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https://hg.mozilla.org/integration/gaia-central/rev/ccd1681b96a8
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1138682 - [Camera] remove volume control for notification channel

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "b5de3e6254a638eabba8fd179c952862a0998f4f", 
+        "git_revision": "a8256b632f571b2ed45129213490e14a86e15c7f", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "635899c41e90efa9ef4a796966782f3881aaea1e", 
+    "revision": "c895074895720ed529b54cbe12d42bc697af7538", 
     "repo_path": "integration/gaia-central"
 }