[Main][Refactor]Change ASCEND_QUATIZATION_METHOD to ASCEND_QUANTIZATION_METHOD (#2517)

### What this PR does / why we need it?
The constant ASCEND_QUATIZATION_METHOD in vllm_ascend/utils.py is
misspelled and should be corrected to ASCEND_QUANTIZATION_METHOD.

### Does this PR introduce _any_ user-facing change?
No

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

- vLLM version: v0.10.1.1
- vLLM main:
c9abb10489

Signed-off-by: zhanghaiwen <zhanghaiwen@cmss.chinamobile.com>
Co-authored-by: zhanghaiwen <zhanghaiwen@cmss.chinamobile.com>

tests/ut/quantization/test_quant_config.py

@@ -10,8 +10,7 @@ from vllm.model_executor.layers.linear import (LinearBase,
 from tests.ut.base import TestBase
 from vllm_ascend.quantization.quant_config import (AscendKVCacheMethod,
                                                    AscendQuantConfig)
-
-ASCEND_QUATIZATION_METHOD = "ascend"
+from vllm_ascend.utils import ASCEND_QUANTIZATION_METHOD
 
 
 class TestAscendQuantConfig(TestBase):
@@ -42,7 +41,7 @@ class TestAscendQuantConfig(TestBase):
 
     def test_get_name(self):
         self.assertEqual(AscendQuantConfig.get_name(),
-                         ASCEND_QUATIZATION_METHOD)
+                         ASCEND_QUANTIZATION_METHOD)
 
     def test_get_supported_act_dtypes(self):
         supported_dtypes = AscendQuantConfig.get_supported_act_dtypes()
@@ -66,7 +65,7 @@ class TestAscendQuantConfig(TestBase):
         # Test when NPU is available
         mock_is_available.return_value = True
         result = AscendQuantConfig.override_quantization_method(None, None)
-        self.assertEqual(result, ASCEND_QUATIZATION_METHOD)
+        self.assertEqual(result, ASCEND_QUANTIZATION_METHOD)
 
         # Test when NPU is not available
         mock_is_available.return_value = False