Add .clang-ignore for jenkins test

Signed-off-by: Zhenfei Tai <ztai@google.com>
Change-Id: Ifb96d47b8b62c5aeb590439ab3655e336063f80e
diff --git a/.clang-ignore b/.clang-ignore
new file mode 100644
index 0000000..dd3c5fc
--- /dev/null
+++ b/.clang-ignore
@@ -0,0 +1 @@
+./host-kernel