[dv/lc_ctrl] Fix lc_ctrl regression failure
[dv/lc_ctrl] Fix lc_ctrl regression failure

There are lc_ctrl regression failure regarding comparing with X output.
The issue is the index of EscalationSt should use the decoded version.

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

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