tests/acceptance: Let the framework handle "cpu:VALUE" tagged tests

tests/acceptance: Let the framework handle "cpu:VALUE" tagged tests

The tests that are already tagged with "cpu:VALUE" don't need to add
"-cpu VALUE" to the list of arguments of the vm object because the avocado_qemu
framework is able to handle it automatically.

Reviewed-by: Cleber Rosa <crosa@redhat.com>
Tested-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20210430133414.39905-4-wainersm@redhat.com>
Signed-off-by: Cleber Rosa <crosa@redhat.com>