VOL-793: Makefile debian target for openolt driver

Change-Id: I9d71af17a4adc1d988dd85c76f1af1738c084b86
diff --git a/mkdebian/debian/compat b/mkdebian/debian/compat
new file mode 100644
index 0000000..ec63514
--- /dev/null
+++ b/mkdebian/debian/compat
@@ -0,0 +1 @@
+9