manifest: Unstage 15.1

Change-Id: Ib3d3ac1b2e54cc8acf41cb7f490db3f606a8e528
diff --git a/default.xml b/default.xml
index 5e6bf13..8f598c6 100644
--- a/default.xml
+++ b/default.xml
@@ -13,7 +13,7 @@
            review="android-review.googlesource.com"
            revision="refs/tags/android-8.1.0_r11" />
 
-  <default revision="refs/heads/staging/lineage-15.1"
+  <default revision="refs/heads/lineage-15.1"
            remote="github"
            sync-c="true"
            sync-j="4" />