[BugFix] Fix chunked prefill bugs in engine v1 (#844)

### What this PR does / why we need it?
Fix the bugs when run deepseek model in engine v1.

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

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

---------

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

vllm_ascend/platform.py

@@ -204,6 +204,9 @@ class NPUPlatform(Platform):
                     "ascend_scheduler_config", None) is not None:
                 additional_scheduler_config = additional_config.get(
                     "ascend_scheduler_config")
+                if vllm_config.scheduler_config.enable_chunked_prefill:
+                    additional_scheduler_config[
+                        "enable_chunked_prefill"] = True
                 from vllm_ascend.core.schedule_config import \
                     AscendSchedulerConfig
                 ascend_scheduler_config = AscendSchedulerConfig.initialize_from_config(