Fix appData field type

bug: 77732157
test: CTS MediaCasTest; VTS VtsHalCasV1_0Target.

Change-Id: Ia8c2f2c81894a6c083c07cd29ca28bc2eed74529
diff --git a/headers/media_plugin/media/cas/CasAPI.h b/headers/media_plugin/media/cas/CasAPI.h
index 67f4511..4de314d 100644
--- a/headers/media_plugin/media/cas/CasAPI.h
+++ b/headers/media_plugin/media/cas/CasAPI.h
@@ -63,7 +63,7 @@
     // Construct a new instance of a CasPlugin given a CA_system_id
     virtual status_t createPlugin(
             int32_t CA_system_id,
-            uint64_t appData,
+            void *appData,
             CasPluginCallback callback,
             CasPlugin **plugin) = 0;