hwid: Skip valid HWID database test for boards which do not have test files.

BUG=None
TEST=make lint test

Change-Id: I8ee788a636fad331c965543cf9e5b80f797f4a04
Reviewed-on: https://gerrit.chromium.org/gerrit/65558
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
1 file changed