usb_ecm: Disable tracing by default.

(cherry picked from commit f156c66999)

Change-Id: I7f554ec14ebae0d76a0fce693b5eb66871ddd312
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5784
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

src/add-ons/kernel/drivers/network/ether/usb_ecm/Driver.h

@@ -74,10 +74,14 @@ typedef struct {
 } usb_ecm_driver_info;
 
 
-
+#ifdef TRACE_ECM
 #define	TRACE(x...)			dprintf(DRIVER_NAME ": " x)
-#define TRACE_ALWAYS(x...)	dprintf(DRIVER_NAME ": " x)
 #define CALLED() 			TRACE("CALLED %s\n", __PRETTY_FUNCTION__)
+#else
+#define TRACE(x...)
+#define CALLED()
+#endif
+#define TRACE_ALWAYS(x...)	dprintf(DRIVER_NAME ": " x)
 
 
 #endif //_USB_ECM_DRIVER_H_