[NPU]:Replace 'cuda' in the project with abstract interfaces

diffsynth/models/wan_video_dit.py

@@ -5,7 +5,6 @@ import math
 from typing import Tuple, Optional
 from einops import rearrange
 from .wan_video_camera_controller import SimpleAdapter
-
 try:
     import flash_attn_interface
     FLASH_ATTN_3_AVAILABLE = True