[bsp][nxp] Fix scons command can not found 'sdk_dist'

bsp/nxp/mcx/mcxn/frdm-mcxn947/rtconfig.py

@@ -192,7 +192,7 @@ elif PLATFORM == 'iccarm':
 
 def dist_handle(BSP_ROOT, dist_dir):
     cwd_path = os.getcwd()
-    sys.path.append(os.path.join(os.path.dirname(BSP_ROOT), 'tools'))
+    sys.path.append(os.path.join(os.path.dirname(BSP_ROOT), '..', 'tools'))
     from sdk_dist import dist_do_building
     dist_do_building(BSP_ROOT, dist_dir)