cxl: Remove leftover attribute documentation in 'struct cxl_dev_state'

cxl: Remove leftover attribute documentation in 'struct cxl_dev_state'

commit 14d788740774 ("cxl/mem: Consolidate CXL DVSEC Range enumeration
in the core")

...removed @info from 'struct cxl_dev_state', but neglected to remove
the corresponding kernel-doc entry. Complete the removal.

Reported-by: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Closes: 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/168679259703.3436160.12583306507362357946.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>