intel/genxml: Drop assertion to allow for importing

For example, gen11.xml will import the HEVC_ARBITRATION_PRIORITY
struct from gen9.xml.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20593>

src/intel/genxml/intel_genxml.py

@@ -73,8 +73,6 @@ class Struct(object):
         for d in deps.keys():
             if d in struct_dict:
                 self.deps[d] = struct_dict[d]
-            else:
-                assert d in enum_dict
 
     def add_xml(self, items: typing.OrderedDict[str, et.Element]) -> None:
         for d in self.deps.values():