[BL602] Inclease udp endpoint num, to fix mdns advertise fail (#21228)

Author: jczhang777

src/platform/bouffalolab/BL602/InetPlatformConfig.h

@@ -43,5 +43,5 @@
 #endif // INET_CONFIG_NUM_TCP_ENDPOINTS
 
 #ifndef INET_CONFIG_NUM_UDP_ENDPOINTS
-#define INET_CONFIG_NUM_UDP_ENDPOINTS 4
+#define INET_CONFIG_NUM_UDP_ENDPOINTS 6
 #endif // INET_CONFIG_NUM_UDP_ENDPOINTS