[polly] polly: Fix typos discovered by codespell (PR #124545)

[Christian Clauss via llvm-commits]

================
@@ -72,7 +72,7 @@ def initialize_isl_methods(self):
         if hasattr(self.__class__, "initialized"):
             return
 
-        self.__class__.initalized = True
+        self.__class__.initialized = True
----------------
cclauss wrote:

Code change: Extra review, please.

https://github.com/llvm/llvm-project/pull/124545