CMake: remove string.h in STM32 usb, already included (#13773)

0xc0170 · hugueskamba · commit 448986feb6c1 · 2020-11-06T17:25:22.000Z
diff --git a/targets/TARGET_STM/USBPhyHw.h b/targets/TARGET_STM/USBPhyHw.h
@@ -28,7 +28,6 @@
 #include "platform/mbed_power_mgmt.h"
 #include "USBPhy.h"
 #include "PeripheralPins.h"
-#include "string.h"
 
 #if !defined(MBED_CONF_TARGET_USB_SPEED)
 
