intel_sync_upstream.sh: add upstream diff verify

Check the current sources just brought down with the sources in the
upstream branch and flag any files that differ.

Added cleaning of
cros-internal/firmware-brya-14505.B-chromeos-rpl-branch2-private after
force-syncing.

BUG=None
TEST=None

Change-Id: I2954aa095c2fe0e780f2fa36baeda03b966e3c37
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/5353249
Reviewed-by: Subrata Banik <subratabanik@chromium.org>
Commit-Queue: Nick Vaccaro <nvaccaro@google.com>
Tested-by: Nick Vaccaro <nvaccaro@google.com>
1 file changed