Initialize linear vs minmax binary operator microkernels for web assembly.

PiperOrigin-RevId: 319818658
diff --git a/src/xnnpack/operator.h b/src/xnnpack/operator.h
index fe8cc85..1434f5a 100644
--- a/src/xnnpack/operator.h
+++ b/src/xnnpack/operator.h
@@ -149,6 +149,10 @@
   uint8_t mr;
 };
 
+struct xnn_ukernel_vbinary {
+  xnn_vbinary_ukernel_function function;
+};
+
 struct xnn_ukernel {
   enum xnn_ukernel_type type;
   union {
@@ -159,6 +163,7 @@
     struct xnn_ukernel_igemm igemm;
     struct xnn_ukernel_spmm spmm;
     struct xnn_ukernel_vmulcaddc vmulcaddc;
+    struct xnn_ukernel_vbinary vbinary;
   };
 };