Update ports/raspberrypi/common-hal/wifi/Radio.c

u32_t -> uint32_t

Co-authored-by: MicroDev <[email protected]>

Author: bill88t

ports/raspberrypi/common-hal/wifi/Radio.c

@@ -61,7 +61,7 @@
 #endif
 
 #ifdef LWIP_DEBUG
-static u32_t ping_time;
+static uint32_t ping_time;
 #endif