Merge branch 'for-7.1/cxl-region-refactor' into cxl-for-next

Refactor CXL core/region code to make region code more manageable by
splitting out DAX and PMEM code from RAM handling code.

cxl/core: use cleanup.h for devm_cxl_add_dax_region
cxl/core/region: move dax region device logic into region_dax.c
cxl/core/region: move pmem region driver logic into region_pmem.c

diff --cc drivers/cxl/core/core.h
Simple merge

diff --cc drivers/cxl/core/region.c
Simple merge

diff --cc drivers/cxl/cxl.h
Simple merge

diff --cc tools/testing/cxl/Kbuild
Simple merge