stm32/lwip_inc: Increase lwIP memory on N6.

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

ports/stm32/lwip_inc/lwipopts.h

@@ -10,6 +10,15 @@
 
 #define LWIP_RAND() rng_get()
 
+// Increase memory for lwIP to get better performance.
+#if defined(STM32N6)
+#define MEM_SIZE                        (16 * 1024)
+#define TCP_MSS                         (1460)
+#define TCP_WND                         (8 * TCP_MSS)
+#define TCP_SND_BUF                     (8 * TCP_MSS)
+#define MEMP_NUM_TCP_SEG                (32)
+#endif
+
 // Include common lwIP configuration.
 #include "extmod/lwip-include/lwipopts_common.h"