[dv/cover_cfg] Exclude prim_alert/esc pairs
[dv/cover_cfg] Exclude prim_alert/esc pairs

This PR excludes prim_alert/esc pairs from IPs because they are fully
verified in DV and FPV testbenches.

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

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