drm/xe/huc: Define HuC binary for BMG

Add the unversioned define for the BMG HuC FW.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240725003224.516233-7-daniele.ceraolospurio@intel.com