[bugfix] matmul_allreduce_add_rmsnorm aclnn interface (#5082)

What this PR does / why we need it?
a2 kernel aclnn interface extern "C" fix

Does this PR introduce any user-facing change?
No

How was this patch tested?
vLLM version: v0.12.0

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,