[dv/otp] Fix lc max count
[dv/otp] Fix lc max count

This PR fixes the max count for lc transition. It used to be 16 now
design updated to 24.
Thanks Dror for catching this.

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

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