Fix dpdk build.

dash-pipeline/bmv2/stages/tunnel_stage.p4

@@ -107,13 +107,17 @@ control tunnel_stage(
 
         // If max member size is greater than 1, the tunnel is programmed with multiple members.
         if (meta.dash_tunnel_max_member_size > 1) {
+#if defined(TARGET_BMV2_V1MODEL)
             // Select tunnel member based on the hash of the packet tuples.
             hash(meta.dash_tunnel_member_index, HashAlgorithm.crc32, (bit<32>)0, {
                 meta.dst_ip_addr,
                 meta.src_ip_addr,
                 meta.src_l4_port,
                 meta.dst_l4_port
             }, meta.dash_tunnel_max_member_size);
+#else
+            meta.dash_tunnel_member_index = 0;
+#endif
             tunnel_member_select.apply();
 
             tunnel_member.apply();