qapi/cryptodev: Drop unwanted 'prefix'

qapi/cryptodev: Drop unwanted 'prefix'

QAPI's 'prefix' feature can make the connection between enumeration
type and its constants less than obvious.  It's best used with
restraint.

QCryptodevBackendServiceType has a 'prefix' that overrides the
generated enumeration constants' prefix to QCRYPTODEV_BACKEND_SERVICE.

Drop it.  The prefix becomes QCRYPTODEV_BACKEND_SERVICE_TYPE.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20240904111836.3273842-18-armbru@redhat.com>