[dv, hmac] Remove the `chip_sw_hmac_enc_irq` from config file
[dv, hmac] Remove the `chip_sw_hmac_enc_irq` from config file

 Removing the tests entry since the `chip_sw_hmac_enc` test
 implement it already.

Signed-off-by: Douglas Reis <df95399f7253aef5711aa5e1f53e8824981313ab@lowrisc.org>

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