Do not assume that a single-target port falls back to a passthrough
decoder configuration. Scan for decoders and only fallback after probing
that the HDM decoder capability is not present.

One user visible affect of this bug is the inability to enumerate
present CXL regions as the decoder settings for the present decoders are
skipped.

Fixes: d17d0540 ("cxl/core/hdm: Add CXL standard decoder enumeration to the core")
Reported-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: http://lore.kernel.org/r/20230227153128.8164-1-Jonathan.Cameron@huawei.com
Cc: <stable@vger.kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/r/168149845130.792294.3210421233937427962.stgit@dwillia2-xfh.jf.intel.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>