Add default "all" makefile targets to the demo tree makefiles.

Demos/DualRole/ClassDriver/MouseHostDevice/DeviceFunctions.c

@@ -144,4 +144,4 @@ void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDI
                                           const uint8_t ReportType, const void* ReportData, const uint16_t ReportSize)
 {
 	// Unused (but mandatory for the HID class driver) in this demo, since there are no Host->Device reports
-}
+}