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

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https://hg.mozilla.org/integration/gaia-central/rev/5c90c9147a6d
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #33727 from Ilphrin/master

Bug 1151847 - [Network Alerts][Refactoring] Use notification "data". r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/7f88a180a120
Author: Kevin_Pellet_(Ilphrin) <ilphrin@autistici.org>
Desc: Bug 1151847 - [Network Alerts][Refactoring] Use notification "data"
attribute instead of icon URL query string parameters. r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/3833b9b555b0
Author: Ricky Chien <rickychien@users.noreply.github.com>
Desc: Merge pull request #33716 from rickychien/extendSystemBanner

Bug 1235128 - [TV][2.5] System banner supports icon and title r=@luke-chang

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https://hg.mozilla.org/integration/gaia-central/rev/ffee21030d0b
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 1235128 - [TV][2.5] System banner supports icon and title

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "ac74a094d01052830fbd42e3721b2118d65a02d6", 
+        "git_revision": "64dd32a7e54a49cb6484fc1b20a578eca1448663", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "cdd990edc9164108c4d608159f623d67f3942901", 
+    "revision": "5c90c9147a6d27330d17ece42cbb761e5e72c901", 
     "repo_path": "integration/gaia-central"
 }