[dv/pattgen] Simplify the cov exclusion file
[dv/pattgen] Simplify the cov exclusion file

This PR removes the extra comments to simplify the cov exclusion file.

Signed-off-by: Cindy Chen <399ad771a111eac8923348b1e2af093034e5d4f1@opentitan.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan