Disable cros license check

mtplot is GPLv2 licensed, but we still want all the other submit checks.

BUG=none
TEST=repo upload mtplot
  => No errors about incorrect license.

Change-Id: I5f50dce643f9ca4278aeaf4494cbb1ec4539cb8a
diff --git a/PRESUBMIT.cfg b/PRESUBMIT.cfg
new file mode 100644
index 0000000..85d2a47
--- /dev/null
+++ b/PRESUBMIT.cfg
@@ -0,0 +1,6 @@
+[Hook Overrides]
+# stray_whitespace_check: false
+# long_line_check: false
+cros_license_check: false
+# tab_check: false
+