[csrc][bugfix] Add compile-time Ascend950/910_95 compatibility for custom ops between CANN8.5 and 9.0 (#6936)

### What this PR does / why we need it?
Remove hardcoded ASCEND910_95 usage in csrc custom-op host/tiling code
and
select the SoC target at CMake configure time.

- Probe CANN headers with check_cxx_source_compiles:
prefer platform_ascendc::SocVersion::ASCEND950, fallback to
ASCEND910_95.
- Export the selected enum/config string via shared compile definitions
(VLLM_ASCEND_950_SOC_ENUM / VLLM_ASCEND_950_SOC_CONFIG).
- Apply the shared macros to affected paths (moe_gating_top_k,
add_rms_norm_bias) to avoid per-file hardcoding.
- Keep behavior unchanged; this is an internal build-compatibility fix
for CANN 8.5 and 9.x.

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

### How was this patch tested?

- vLLM version: v0.16.0
- vLLM main:
15d76f74e2

---------

Signed-off-by: linfeng-yuan <1102311262@qq.com>

csrc/moe_gating_top_k/op_host/moe_gating_top_k_def.cpp

@@ -63,9 +63,9 @@ public:
             .DynamicRankSupportFlag(true)
             .DynamicShapeSupportFlag(true)
             .ExtendCfgInfo("opFile.value", "moe_gating_top_k_apt");
-        this->AICore().AddConfig("ascend910_95", regbaseCfg);
+        this->AICore().AddConfig(VLLM_ASCEND_950_SOC_CONFIG, regbaseCfg);
     }
 };
 
 OP_ADD(MoeGatingTopK);
-} // namespace ops
+} // namespace ops

csrc/moe_gating_top_k/op_host/moe_gating_top_k_tiling_arch35.cpp

@@ -27,7 +27,7 @@
 #define CEIL_DIV(a, b) (((a) + (b) - 1) / (b))
 #endif
 namespace optiling {
-const static uint64_t MOE_GATING_TOP_K_REGBASE_TILING_KEY = 10000;
+const static uint64_t MOE_GATING_TOP_K_ASCEND_950_TILING_KEY = 10000;
 
 const static int64_t GROUP_SELECT_MODE_MAX = 0;
 const static int64_t GROUP_SELECT_MODE_SUM = 1;
@@ -79,7 +79,7 @@ public:
 protected:
     bool IsCapable() override
     {
-        if (socVersion != platform_ascendc::SocVersion::ASCEND910_95) {
+        if (socVersion != platform_ascendc::SocVersion::VLLM_ASCEND_950_SOC_ENUM) {
             return false;
         }
         return true;
@@ -508,7 +508,7 @@ ge::graphStatus MoeGatingTopKTilingRegbase::PostTiling()
 
 uint64_t MoeGatingTopKTilingRegbase::GetTilingKey() const
 {
-    return MOE_GATING_TOP_K_REGBASE_TILING_KEY;
+    return MOE_GATING_TOP_K_ASCEND_950_TILING_KEY;
 }
 
 void MoeGatingTopKTilingRegbase::Reset()