base-files: /etc/services: add missing 'rpcbind' alias

* add missing 'rpcbind' alias to /etc/services

Allows rpcbind to open its 111 port and be reachable via lan, this is the default behaviour.

Signed-off-by: Andy Walsh <andy.walsh44+github@gmail.com>

package/base-files/files/etc/services

@@ -29,8 +29,8 @@ kerberos	88/tcp		kerberos5 krb5 kerberos-sec
 kerberos	88/udp		kerberos5 krb5 kerberos-sec
 pop3		110/tcp
 pop3		110/udp
-sunrpc		111/tcp
-sunrpc		111/udp
+sunrpc		111/tcp		rpcbind
+sunrpc		111/udp		rpcbind
 auth		113/tcp		ident
 sftp		115/tcp
 nntp		119/tcp