[otp_ctrl] Fix scrmbl assertion failure
[otp_ctrl] Fix scrmbl assertion failure

Fix a small enum typo in otp_ctrl assertion.
Delete IV check because it is tied to constant.

Signed-off-by: Cindy Chen <399ad771a111eac8923348b1e2af093034e5d4f1@google.com>

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