m1n1.adt: Fix parsing of reg properties without size annotation

The M5 14-inch Macbook Pro has "dptx?-aux-core" nodes with reg property
but their parent nodes are missing "#address-cells" / "#size-cells"
properties.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

proxyclient/m1n1/adt.py

@@ -710,6 +710,8 @@ def __iter__(self):
 
     @property
     def _reg_struct(self):
+        if not hasattr(self._parent, "address_cells") or not hasattr(self._parent, "size_cells"):
+            return Int32ul
         ac, sc = self._parent.address_cells, self._parent.size_cells
         return Struct(
             "addr" / Hex(Int64ul) if ac == 2 else Array(ac, Hex(Int32ul)),