Fix gitignore for recently added usptream self tests

This resolves the issue that generated binary is showing up as an untracked git file after every build on the kernel.
Signed-off-by: Weihao Gao <weihaogao@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/.gitignore

@@ -8,8 +8,10 @@ diag_uid
 fin_ack_lat
 gro
 hwtstamp_config
+io_uring_zerocopy_tx
 ioam6_parser
 ip_defrag
+ip_local_port_range
 ipsec
 ipv6_flowlabel
 ipv6_flowlabel_mgr
@@ -26,6 +28,7 @@ reuseport_bpf_cpu
 reuseport_bpf_numa
 reuseport_dualstack
 rxtimestamp
+sctp_hello
 sk_bind_sendto_listen
 sk_connect_zero_addr
 socket