[Bugfix]Fix the compatibility issue of may_reinitialize_input_batch (#6290)

### What this PR does / why we need it?
Added a check in the may_reinitialize_input_batch method to verify
whether the backend implements the get_supported_block_size method

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

### How was this patch tested?
Only a few lines of code within the methods were modified, and the
format check test has been passed.
- vLLM version: v0.14.1
- vLLM main:
dc917cceb8

---------

Signed-off-by: Debuuuuger <huangzr@cmbchina.com>
Signed-off-by: debuger <102402761+huangazazaz@users.noreply.github.com>
Signed-off-by: Debuuuuger <12110718@mail.sustech.edu.cn>
Co-authored-by: Debuuuuger <huangzr@cmbchina.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

vllm_ascend/attention/attention_v1.py

@@ -127,7 +127,7 @@ class AscendAttentionBackend(AttentionBackend):
             value_caches[dst_indices] = value_caches[src_indices]
 
     @staticmethod
-    def get_supported_block_size() -> list[int]:
+    def get_supported_kernel_block_sizes() -> list[int]:
         return [128]
 
 
@@ -227,7 +227,7 @@ class AscendAttentionMetadataBuilder(AttentionMetadataBuilder[AscendMetadata]):
         self.compilation_config = vllm_config.compilation_config
         self.device = device
         self.max_num_blocks_per_req = cdiv(
-            self.model_config.max_model_len, AscendAttentionBackend.get_supported_block_size()[0]
+            self.model_config.max_model_len, AscendAttentionBackend.get_supported_kernel_block_sizes()[0]
         )
 
         self.speculative_config = vllm_config.speculative_config

vllm_ascend/attention/mla_v1.py

@@ -89,6 +89,10 @@ class AscendMLABackend(AttentionBackend):
             return AscendMlaCPImpl
         return AscendMLAImpl
 
+    @staticmethod
+    def get_supported_kernel_block_sizes() -> list[int]:
+        return [128]
+
 
 @dataclass
 class ChunkedContextMetadata:

vllm_ascend/attention/sfa_v1.py

@@ -78,6 +78,10 @@ class AscendSFABackend(AttentionBackend):
     def get_impl_cls() -> type["AscendSFAImpl"]:
         return AscendSFAImpl
 
+    @staticmethod
+    def get_supported_kernel_block_sizes() -> list[int]:
+        return [128]
+
 
 @dataclass
 class DSACPContext: