[Patch] Remove the patch of ECExampleConnector (#5976)

### What this PR does / why we need it?
Part of #5304.

https://github.com/vllm-project/vllm/pull/30225 has been merged now. We
don't need this patch anymore.

- vLLM version: v0.13.0
- vLLM main:
2c24bc6996

Signed-off-by: gcanlin <canlinguosdu@gmail.com>

vllm_ascend/patch/platform/__init__.py

@@ -17,7 +17,6 @@
 import os
 
 import vllm_ascend.patch.platform.patch_distributed  # noqa
-import vllm_ascend.patch.platform.patch_ec_connector  # noqa
 import vllm_ascend.patch.platform.patch_mamba_config  # noqa
 import vllm_ascend.patch.platform.patch_sched_yield  # noqa
 from vllm_ascend import envs