xgl: Remove old GPU maxMemReferencesPerSubmission

The GPU property maxMemReferencesPerSubmission is now
in the GPU QUEUE properties as maxMemReferences.
diff --git a/icd/intel/cmd.c b/icd/intel/cmd.c
index b55b10a..8edfd85 100644
--- a/icd/intel/cmd.c
+++ b/icd/intel/cmd.c
@@ -284,7 +284,7 @@
     cmd->pipeline_select = pipeline_select;
 
     /*
-     * XXX This is not quite right.  intel_gpu sets maxMemRefsPerSubmission to
+     * XXX This is not quite right.  intel_gpu sets maxMemReferences to
      * batch_buffer_reloc_count, but we may emit up to two relocs, for start
      * and end offsets, for each referenced memories.
      */