Documentation/cxl: Document DPA partition layout and ordering rules

DC Partitions complicate DPA ordering. Add a DPA Partitions section to
cxl-driver.rst describing spec-mandated and Linux requirements for the
layout.

maturity-map.rst breaks the DCD entry into sub-items so the map shows
what this series lands: partition enumeration is [1], event handling
and DC-backed DAX regions remain [0] until the follow-on series enables
them. The parent stays [0]; nothing is usable yet.

Suggested-by: Gregory Price <gourry@gourry.net>
Signed-off-by: Anisa Su <anisa.su@samsung.com>
Tested-by: Wonjae Lee <wj28.lee@samsung.com>
Tested-by: Junhee Park <jh9934.park@samsung.com>
Tested-by: Heesoo Kim <habil.kim@samsung.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Gregory Price (Meta) <gourry@gourry.net>
Link: https://patch.msgid.link/20261010225852.10727-9-anisa.su@samsung.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

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