tools/testing/cxl: Fix decoder default state

The 'enabled' state is reserved for committed decoders. By default,
cxl_test decoders are uncommitted at init time.

Fixes: 7c7d68db ("tools/testing/cxl: Enumerate mock decoders")
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165603888091.551046.6312322707378021172.stgit@dwillia2-xfh


Signed-off-by: Dan Williams <dan.j.williams@intel.com>