drm/xe/guc: Add support for LNL firmware

First release of GuC firmware for LNL is now available, so start
using it.

v2: Actually use xe directory. Doh! (review feedback from Lucas)

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240202200017.2133438-6-John.C.Harrison@Intel.com