versioner: add missing test.

Change-Id: I1dc9a708b53dbb46af9e4b8ab69bf8ed46ab045f
diff --git a/tools/versioner/tests/version_mismatch/run.sh b/tools/versioner/tests/version_mismatch/run.sh
new file mode 100644
index 0000000..914c55d
--- /dev/null
+++ b/tools/versioner/tests/version_mismatch/run.sh
@@ -0,0 +1 @@
+versioner headers -p platforms -r arm -a 9 -a 12