restore matmul_allreduce_add_rmsnrom aclnn interface (#5119)

**What this PR does / why we need it?**
restore a2 matmul_allreduce_add_rmsnrom kernel  aclnn interface 

**How was this patch tested?**
- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

Signed-off-by: tongrunze <t00574058@china.huawei.com>
Co-authored-by: tongrunze <t00574058@china.huawei.com>

csrc/matmul_allreduce_add_rmsnorm/op_host/aclnn_matmul_allreduce_add_rmsnorm.cpp

@@ -26,6 +26,10 @@ enum NnopbaseHcclServerType {
 };
 extern "C" void __attribute__((weak)) NnopbaseSetHcclServerType(void *executor, NnopbaseHcclServerType sType);
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern aclnnStatus aclnnInnerMatmulAllreduceAddRmsnormGetWorkspaceSize(
     const aclTensor *x1,
     const aclTensor *x2,
@@ -48,10 +52,6 @@ extern aclnnStatus aclnnInnerMatmulAllreduceAddRmsnorm(
     aclOpExecutor *executor,
     aclrtStream stream);
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 aclnnStatus aclnnMatmulAllreduceAddRmsnormGetWorkspaceSize(
     const aclTensor *x1,
     const aclTensor *x2,