rp2/cyw43_configport: Add event hook into cyw43_delay_ms.

Still see some USB issues apparently caused by delays loading wifi
firmware.  cyw43_delay_ms is used to wait in the driver, so we should call
the event hook in there.

Fixes #8963.

ports/rp2/cyw43_configport.h

@@ -93,6 +93,7 @@ static inline void cyw43_delay_ms(uint32_t ms) {
     int32_t start = mp_hal_ticks_us();
     while (mp_hal_ticks_us() - start < us) {
         __WFI();
+        MICROPY_EVENT_POLL_HOOK_FAST;
     }
 }