update tock submodule
diff --git a/tock b/tock
index 6e38588..6260afa 160000
--- a/tock
+++ b/tock
@@ -1 +1 @@
-Subproject commit 6e38588c73dbd78d274c00ae7fb7789b78cf6856
+Subproject commit 6260afac204ae9f469abe9e2573cb51d3b124624