manifest: fix branch for android repo

Change-Id: Ib5d4d24f0c4dd8536749f95be597e6b3d98e923d
diff --git a/omni-default.xml b/omni-default.xml
index ffbfec8..f500982 100644
--- a/omni-default.xml
+++ b/omni-default.xml
@@ -11,7 +11,7 @@
   <include name="omni-caf.xml" />
 
   <!-- OmniROM Projects -->
-  <project path="android" name="android" remote="omnirom" revision="android-8.0" />
+  <project path="android" name="android" remote="omnirom" revision="android-8.1" />
 
   <project path="vendor/omni" name="android_vendor_omni" remote="omnirom" revision="android-8.0" />