cherry-pick pr3067 (#3087)

Signed-off-by: lyj-jjj <liuyingjun5@huawei.com>

vllm_omni/diffusion/models/wan2_2/patch_diffusers.py

@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+import sys
+
+from vllm_omni.diffusion.layers.norm import RMSNormVAE
+
+
+def patch_wan_rms_norm():
+    """Patch diffusers Wan RMSNorm implementation with RMSNormVAE."""
+
+    for module_name, module in sys.modules.items():
+        if hasattr(module, "WanRMS_norm"):
+            setattr(module, "WanRMS_norm", RMSNormVAE)