Add lk submodule.

Change-Id: Id7b3f9edf86bb96231483a3a6f05dba8f8031b1b
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..be56ccf
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lk"]
+	path = lk
+	url = https://github.com/littlekernel/lk
diff --git a/lk b/lk
new file mode 160000
index 0000000..0c97b7f
--- /dev/null
+++ b/lk
@@ -0,0 +1 @@
+Subproject commit 0c97b7f6a147f47cb71f6d04e8edaacee0738608