cyw43_tcpip_link_status when not using lwip (#3007)

This function is implemented by cyw43_driver using lwip to determine
when the link is up and an IP address has been assigned.

If you are not using lwip you get a link error as it's used in
cyw43_arch_wifi_connect_bssid_until

As with other cyw43 lwip functions we need a weak implementation that
panics as we expect the app to provide their own implementation if
not using lwip.

Fixes #2704

src/rp2_common/pico_cyw43_driver/cyw43_driver.c

diff --git a/src/rp2_common/pico_cyw43_driver/cyw43_driver.c b/src/rp2_common/pico_cyw43_driver/cyw43_driver.c
index 95e5da5..347ddd5 100644
--- a/src/rp2_common/pico_cyw43_driver/cyw43_driver.c
+++ b/src/rp2_common/pico_cyw43_driver/cyw43_driver.c
@@ -291,4 +291,8 @@
 void __attribute__((weak)) cyw43_cb_process_ethernet(__unused void *cb_data, __unused int itf, __unused size_t len, __unused const uint8_t *buf) {
     no_lwip_fail();
 }
+int __attribute__((weak)) cyw43_tcpip_link_status(cyw43_t *self, int itf) {
+    no_lwip_fail();
+    return 0;
+}
 #endif