net: lwip: enable debug traces for SNTP when CONFIG_LWIP_DEBUG is set

Now that SNTP is supported, enable SNTP debug traces when LWIP_DEBUG is
enabled. In particular, this allows to see which NTP servers are
received during DHCP.

Signed-off-by: Jerome Forissier <[email protected]>

Author: jforissier

lib/lwip/u-boot/lwipopts.h

@@ -44,6 +44,7 @@
 #define DNS_DEBUG                       LWIP_DBG_ON
 #define IP6_DEBUG                       LWIP_DBG_OFF
 #define DHCP6_DEBUG                     LWIP_DBG_OFF
+#define SNTP_DEBUG                      LWIP_DBG_ON
 #endif
 
 #define LWIP_TESTMODE                   0