cxl: Fix kernel-doc warnings

cxl: Fix kernel-doc warnings

After Jonathan noticed [1] that 'struct cxl_dev_state' had a kernel-doc
entry without a corresponding struct attribute I ran the kernel-doc
script to see what else might be broken. Fix these warnings:

drivers/cxl/cxlmem.h:199: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * Event Interrupt Policy
drivers/cxl/cxlmem.h:224: warning: Function parameter or member 'buf' not described in 'cxl_event_state'
drivers/cxl/cxlmem.h:224: warning: Function parameter or member 'log_lock' not described in 'cxl_event_state'

Note that scripts/kernel-doc only finds missing kernel-doc entries. It
does not warn on too many kernel-doc entries, i.e. it did not catch the
fact that @info refers to a not present member.

Link: http://lore.kernel.org/r/20230606121054.000069e1@Huawei.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/168679259170.3436160.3686460404739136336.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>