Allow using 3 different NTP servers and NTP over DHCP (#101)

* allow using 3 different NTP servers and NTP over DHCP

* undo wrong change

---------

Co-authored-by: Jason2866 <24528715+Jason2866@users.noreply.github.com>

Author: vortigont

configs/defconfig.common

@@ -93,7 +93,7 @@ CONFIG_LWIP_IPV6_RDNSS_MAX_DNS_SERVERS=2
 CONFIG_LWIP_MAX_SOCKETS=16
 CONFIG_LWIP_DHCP_RESTORE_LAST_IP=n
 CONFIG_LWIP_DHCP_OPTIONS_LEN=128
-CONFIG_LWIP_SNTP_MAX_SERVERS=1
+CONFIG_LWIP_SNTP_MAX_SERVERS=3
 # CONFIG_LWIP_DHCP_GET_NTP_SRV is not set
 CONFIG_LWIP_SNTP_UPDATE_DELAY=10800000
 CONFIG_LWIP_TCPIP_RECVMBOX_SIZE=48