FP16 Convolution NHWC operator

PiperOrigin-RevId: 318540097
diff --git a/src/xnnpack/operator.h b/src/xnnpack/operator.h
index e0fbdcb..385a481 100644
--- a/src/xnnpack/operator.h
+++ b/src/xnnpack/operator.h
@@ -58,6 +58,7 @@
   xnn_operator_type_ceiling_nc_f32,
   xnn_operator_type_constant_pad_nd_x32,
   xnn_operator_type_convolution_nchw_f32,
+  xnn_operator_type_convolution_nhwc_f16,
   xnn_operator_type_convolution_nhwc_f32,
   xnn_operator_type_convolution_nhwc_q8,
   xnn_operator_type_copy_nc_x32,