netinet/tcp.h: add TCP_NLA_* values up to linux v5.12

TCP_NLA_EDT was new in v5.9, see

  linux commit 48040793fa6003d211f021c6ad273477bcd90d91
  tcp: add earliest departure time to SCM_TIMESTAMPING_OPT_STATS

TCP_NLA_TTL is new in v5.12, see

  linux commit e7ed11ee945438b737e2ae2370e35591e16ec371
  tcp: add TTL to SCM_TIMESTAMPING_OPT_STATS

include/netinet/tcp.h

@@ -80,6 +80,8 @@ enum {
 	TCP_NLA_SRTT,
 	TCP_NLA_TIMEOUT_REHASH,
 	TCP_NLA_BYTES_NOTSENT,
+	TCP_NLA_EDT,
+	TCP_NLA_TTL,
 };
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)