[NPU] fix npu llava infer (#757)

`paddle.amp.is_bfloat16_supported()` will raise error in NPU device. And
bfloat16 is supported in default at 910B NPU device.

Co-authored-by: LokeZhou <aishenghuoaiqq@163.com>

paddlemix/examples/llava/run_predict_multiround.py

@@ -36,7 +36,11 @@
 def main(args):
     paddle.seed(seed=0)
     compute_dtype = "float16" if args.fp16 else "bfloat16"
-    if compute_dtype== "bfloat16" and not paddle.amp.is_bfloat16_supported():
+    if "npu" in paddle.get_device():
+        is_bfloat16_supported = True
+    else:
+        is_bfloat16_supported = paddle.amp.is_bfloat16_supported()
+    if compute_dtype== "bfloat16" and not is_bfloat16_supported:
         logger.warning("bfloat16 is not supported on your device,change to float32")
         compute_dtype = "float32"