[dv/hmac] Fix Xcelium compile error
[dv/hmac] Fix Xcelium compile error

Shouldn't drive wire (pins_if.pins) in task, use pins_if.drive_pin
instead

Signed-off-by: Weicai Yang <4fa8c7762ee4da95e3dee7dae2c3263ea16637f9@google.com>

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