drm/xe: Remove GEN11 prefixes from documentation

The registers are already named without the GEN11 prefix. Do the same in
the memirq documentation.

Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250306-drop-gen-v1-2-03683e56006a@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/xe/xe_memirq.c

@@ -86,7 +86,7 @@ static const char *guc_name(struct xe_guc *guc)
  *   This object needs to be 4KiB aligned.
  *
  * - _`Interrupt Source Report Page`: this is the equivalent of the
- *   GEN11_GT_INTR_DWx registers, with each bit in those registers being
+ *   GT_INTR_DWx registers, with each bit in those registers being
  *   mapped to a byte here. The offsets are the same, just bytes instead
  *   of bits. This object needs to be cacheline aligned.
  *