manifest: fork android_build_soong

Change-Id: I58a91af654f1ae18885c7c9bff72fa8fc529f377
diff --git a/omni-aosp.xml b/omni-aosp.xml
index 028e7a2..55aec1b 100644
--- a/omni-aosp.xml
+++ b/omni-aosp.xml
@@ -17,5 +17,5 @@
     <linkfile src="target" dest="build/target" />
     <linkfile src="tools" dest="build/tools" />
   </project>
-
+  <project path="build/soong" name="android_build_soong" remote="omnirom" revision="android-8.0" />
 </manifest>