[lk] Roll to a valid upstream revision.

The previous revision pointed to a rev from a local clone.

Change-Id: I58840b547eea094c8869ab1cbd9b0700bb36c602
diff --git a/lk b/lk
index 66372d7..5d766ef 160000
--- a/lk
+++ b/lk
@@ -1 +1 @@
-Subproject commit 66372d72b6a3d5bbeb5c73f0a05f4fabca4399f5
+Subproject commit 5d766ef5920c3e45a568709bdf85bf983927b26b