drm/xe: Wire up devcoredump in documentation

Add a documentation page to detail the device coredump as implemented by
xe - it was documented in the source code, but not visible in the
rendered (html) documentation.

Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Raag Jadav <raag.jadav@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241102161254.1818604-3-lucas.demarchi@intel.com


Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>