Add u-boot-vboot-integration to pre-upload checks

u-boot-vboot-integration is imported from our U-Boot repo and so it
follows Linux kernel coding style.

BUG=chromium-os:20453
TEST=Submit a u-boot-vboot-integration patch and observe checkpatch
     violations

Change-Id: I0821a8822991567e6d3582a571e090435f8e78f5
Reviewed-on: http://gerrit.chromium.org/gerrit/10399
Reviewed-by: Che-Liang Chiou <clchiou@chromium.org>
Tested-by: Che-Liang Chiou <clchiou@chromium.org>
diff --git a/pre-upload.py b/pre-upload.py
index cf14647..4a647cd 100644
--- a/pre-upload.py
+++ b/pre-upload.py
@@ -345,6 +345,7 @@
     "chromiumos/third_party/kernel": [_run_checkpatch],
     "chromiumos/third_party/kernel-next": [_run_checkpatch],
     "chromiumos/third_party/u-boot": [_run_checkpatch_no_tree],
+    "chromiumos/platform/u-boot-vboot-integration": [_run_checkpatch_no_tree],
     "chromeos/autotest-tools": [_run_json_check],
 }