Allow LwIP to be disabled by default

The cyw43-driver enables LwIP if CYW43_LWIP is not defined.
Allow LwIP to be disabled by default if CYW43_LWIP is not defined so we
can use the driver to access the led without needing to link to LwIP.

Add CYW43_LWIP_DEFAULT to enable this.

Author: peterharperuk

src/rp2_common/pico_cyw43_driver/include/cyw43_configport.h

@@ -198,6 +198,11 @@ void cyw43_post_poll_hook(void);
 #define cyw43_free free
 #endif
 
+// PICO_CONFIG: CYW43_LWIP_DEFAULT, The cyw43-driver uses LwIP by default, you can define CYW43_LWIP_DEFAULT=0 to disable LwIP by default, type=bool, group=pico_cyw43_driver
+#if !defined CYW43_LWIP && defined CYW43_LWIP_DEFAULT
+#define CYW43_LWIP CYW43_LWIP_DEFAULT
+#endif
+
 #ifdef __cplusplus
 }
 #endif