Add Policy manager repo

BUG=b/73012579
TEST=Performed repo sync src/third_party/policymanager to see if the
repo gets initialized

Change-Id: I7e1506dc15160795cb7dcee5b0becb461a3a3d69
Reviewed-on: https://cos-review.googlesource.com/c/cos/manifest/+/21350
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Rayan Dasoriya <dasoriya@google.com>
diff --git a/external_full.xml b/external_full.xml
index bc67e6e..48f9e1d 100644
--- a/external_full.xml
+++ b/external_full.xml
@@ -93,6 +93,9 @@
   <project path="manifest" name="cos/manifest" >
       <copyfile src="LICENSE" dest="LICENSE" />
   </project>
+  <project path="src/third_party/policymanager"
+           name="cos/policymanager"
+           revision="refs/heads/main" />
   <project path="src/third_party/toolbox"
            name="third_party/toolbox"
            revision="refs/heads/main" />