manifest: Sync x86_64 webview prebuilts again

Also, no need to shallow-clone the other arch prebuilts either.

git-lfs magic ^^

Change-Id: Ica014d199265b7c037087d25937271e5a6553a82
diff --git a/README.mkdn b/README.mkdn
index 58ad669..a38d4a0 100644
--- a/README.mkdn
+++ b/README.mkdn
@@ -8,7 +8,7 @@
 
 To initialize your local repository using the LineageOS trees, use a command like this:
 ```
-repo init -u https://github.com/LineageOS/android.git -b lineage-20.0
+repo init -u https://github.com/LineageOS/android.git -b lineage-20.0 --git-lfs
 ```
 Then to sync up:
 ```