Update simple_l3 P4 program actions to use PSA pre-defined actions

Modified simple_l3 P4 program to use the PSA pre-defined
send_to_port and ingress_drop actions instead of updating
the psa_ingress_output_metadata_t structure directly.

Signed-off-by: Venkata Suresh Kumar P <[email protected]>

Author: vsureshkumarp

build/networking/examples/simple_l3/simple_l3.p4

@@ -112,11 +112,11 @@ control ingress(
 )
 {
     action send(PortId_t port) {
-        ostd.egress_port = (PortId_t) port;
+        send_to_port(ostd, port);
     }
 
     action drop() {
-        ostd.drop = true;
+        ingress_drop(ostd);
     }
 
     table ipv4_host {