Fix Ethernet driver build (#11096)

hugueskamba · evedon · commit bcc4aaff458d · 2019-07-23T15:43:19.000+01:00
Include the missing header file inclusion to find the added
MBED_DEPRECATED macro.
diff --git a/hal/ethernet_api.h b/hal/ethernet_api.h
@@ -21,6 +21,7 @@
 #define MBED_ETHERNET_API_H
 
 #include "device.h"
+#include "platform/mbed_toolchain.h"
 
 #if DEVICE_ETHERNET
 
