improve soc version (#4522)

Make SOC_VERSION be readable for users. Now users can set simply
"910b"、“910c”、“310p”


- vLLM version: v0.11.2
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.2

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

Dockerfile.a3

@@ -20,7 +20,7 @@ FROM quay.io/ascend/cann:8.3.rc2-a3-ubuntu22.04-py3.11
 ARG PIP_INDEX_URL="https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple"
 ARG COMPILE_CUSTOM_KERNELS=1
 ARG MOONCAKE_TAG=v0.3.7.post2
-ARG SOC_VERSION
+ARG SOC_VERSION="ascend910_9391"
 
 COPY . /vllm-workspace/vllm-ascend/
 # Define environments