cxl/pci: Store the endpoint's Component Register mappings in struct cxl_dev_state

cxl/pci: Store the endpoint's Component Register mappings in struct cxl_dev_state

Same as for ports and dports, also store the endpoint's Component
Register mappings, use struct cxl_dev_state for that.

Keep the Component Register base address @component_reg_phys a bit to
not break functionality. It will be removed after the transition in a
later patch.

Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Robert Richter <rrichter@amd.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20231018171713.1883517-7-rrichter@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>