net: remove Nuttx legacy UDP checksum functions
udp_ipv4_chksum and udp_ipv6_chksum is only declared in header file.
There is no implementation and also not used anymore. Let's remove this.
@@ -212,30 +212,6 @@ uint16_t tcp_chksum(FAR struct net_driver_s *dev);
#define tcp_chksum(d) tcp_ipv6_chksum(d)
#endif
-/****************************************************************************
- * Name: udp_ipv4_chksum
- *
- * Description:
- * Calculate the UDP/IPv4 checksum of the packet in d_buf and d_appdata.
- *
- ****************************************************************************/
-
-#if defined(CONFIG_NET_UDP_CHECKSUMS) && defined(CONFIG_NET_IPv4)
-uint16_t udp_ipv4_chksum(FAR struct net_driver_s *dev);
-#endif
-
-/****************************************************************************
- * Name: udp_ipv6_chksum
- *
- * Description:
- * Calculate the UDP/IPv6 checksum of the packet in d_buf and d_appdata.
- *
- ****************************************************************************/
-
-#if defined(CONFIG_NET_UDP_CHECKSUMS) && defined(CONFIG_NET_IPv6)
-uint16_t udp_ipv6_chksum(FAR struct net_driver_s *dev);
-#endif
-
/****************************************************************************
* Name: icmp_chksum
*
