cxl/memdev: Change cxl_mem to a more descriptive name

The 'struct cxl_mem' object actually represents the state of a CXL
device within the driver. Comments indicating that 'struct cxl_mem' is a
device itself are incorrect. It is data layered on top of a CXL Memory
Expander class device. Rename it 'struct cxl_dev_state'. The 'struct'
cxl_memdev' structure represents a Linux CXL memory device object, and
it uses services and information provided by 'struct cxl_dev_state'.

Update the structure name, function names, and the kdocs to reflect the
real uses of this structure.

Some helper functions that were previously prefixed "cxl_mem_" are
renamed to just "cxl_".

Acked-by: Ben Widawsky <ben.widawsky@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20211102202901.3675568-3-ira.weiny@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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