cxl fixes for 6.7-rc6

- Fix alloc_free_mem_region()'s scan for address space, prevent false
  negative out-of-space events

- Fix sleeping lock acquisition from CXL trace event (atomic context)

- Fix put_device() like for the new CXL PMU driver

- Fix wrong pointer freed on error path

- Fixup several lockdep reports (missing lock hold) from new assertion
  in cxl_num_decoders_committed() and new tests
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