Add pre-submit checks for dtc

We don't want to check tabs or the license.

BUG=chromium-os:23249
TEST=FEATURES=repo upload, check that tab and license errors are not given

Change-Id: Iebd2c7ce2045ab45f49327e838c561cd28955de1
diff --git a/PRESUBMIT.cfg b/PRESUBMIT.cfg
new file mode 100644
index 0000000..ddaa7ff
--- /dev/null
+++ b/PRESUBMIT.cfg
@@ -0,0 +1,7 @@
+[Hook Overrides]
+
+# We need to manually ensure that any new file added has the correct header.
+# There are too many existing files that we are not going to be changing the
+# header on to make use of this automated check.
+cros_license_check: false
+tab_check: false