Don't include lib20 files in xrefs

The vboot 2.0 stuff is deprecated, so let's not index that when
building cross-references (cscope.files and TAGS).

BUG=none
BRANCH=ToT
TEST=manual

make xrefs

Change-Id: If3a9c42f869308acd929e32d5290e3354f5c3555
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/244751
Reviewed-by: Randall Spangler <rspangler@chromium.org>
1 file changed