genxml: Make MI_STORE_DATA_IMM have a single 64-bit data field

This is way more convenient than having two separate dword fields.

Reviewed-By: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/genX_query.c

@@ -283,8 +283,7 @@ void genX(CmdResetQueryPool)(
             .bo = &pool->bo,
             .offset = (firstQuery + i) * pool->stride,
          };
-         sdm.DataDWord0 = 0;
-         sdm.DataDWord1 = 0;
+         sdm.ImmediateData = 0;
       }
    }
 }