libchrome: Removed Chrome OS license check

Since libchrome files are verbatim copies of Chromium code, the
Chrome OS license check in repohooks creates a lot of false
positives.

BUG=None
TEST=Checked that license checks are skipped

Change-Id: I2c50ccacf01d2ebe49e6f19b1dad2aa75d50a8a1
Reviewed-on: https://chromium-review.googlesource.com/506067
Commit-Ready: Lutz Justen <ljusten@chromium.org>
Tested-by: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
diff --git a/PRESUBMIT.cfg b/PRESUBMIT.cfg
new file mode 100644
index 0000000..39603a6
--- /dev/null
+++ b/PRESUBMIT.cfg
@@ -0,0 +1,3 @@
+# Files are verbatim copies of Chromium code base. Disable CrOS license check.
+[Hook Overrides]
+cros_license_check: false