[main][bugfix] Fix MatmulNZ format bug on some machines (#2549)

### What this PR does / why we need it?
This PR fixes the bug on some machines where quantmatmul failed to run
with the NZ format. The change ensures proper execution under the
expected data layout.

### How was this patch tested?
CI passed with existing test.

- vLLM version: v0.10.1.1
- vLLM main:
b5d34af328

Signed-off-by: rjg-lyh <1318825571@qq.com>

vllm_ascend/worker/model_runner_v1.py

@@ -112,6 +112,9 @@ import torch_npu
 
 import vllm_ascend.envs as envs_ascend
 
+# if true, allow tensor initialization and casting with internal format (e.g., NZ)
+torch.npu.config.allow_internal_format = True
+
 if is_310p():
     torch_npu.npu.set_compile_mode(jit_compile=False)
     ACL_FORMAT = ACL_FORMAT_FRACTAL_NZ