[refactor] refactor deepseek-related files (#2849)

### What this PR does / why we need it?
This PR deletes ~2K lines of code about deepseek modeling. It falls back
CustomDeepseekV2 modules to original vllm implementations and adapts
some modifications in vllm about deepseek and moe.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
E2E  vllm serving with torchair graph mode and eager mode.

- vLLM version: v0.10.2
- vLLM main:
759ef49b15

---------

Signed-off-by: linfeng-yuan <1102311262@qq.com>
Signed-off-by: Yizhou Liu <liu_yizhou@outlook.com>
Co-authored-by: yiz-liu <136800916+yiz-liu@users.noreply.github.com>
Co-authored-by: Yizhou Liu <liu_yizhou@outlook.com>

vllm_ascend/patch/platform/patch_common/__init__.py

@@ -17,4 +17,3 @@
 
 import vllm_ascend.patch.platform.patch_common.patch_distributed  # noqa
 import vllm_ascend.patch.platform.patch_common.patch_mamba_config  # noqa
-import vllm_ascend.patch.platform.patch_common.patch_shared_fused_moe  # noqa

vllm_ascend/patch/worker/patch_common/__init__.py

@@ -18,3 +18,4 @@
 import vllm_ascend.patch.worker.patch_common.patch_distributed  # noqa
 import vllm_ascend.patch.worker.patch_common.patch_logits  # noqa
 import vllm_ascend.patch.worker.patch_common.patch_minicpm  # noqa
+import vllm_ascend.patch.worker.patch_common.patch_shared_fused_moe  # noqa