Change USBSerial.h constructor to allow to label the stream for, eg., redirecting stdin/out/err to a USBSerial object. Will not break existing default use as tested with mbed-os 5.11.5

Dependents:   max32630fthr_stdout2usb_mbed_v5-11-5 firmware_framework1

Revision:
47:a0cd9646ecd1
Parent:
25:7c72828865f3
--- a/USBAudio/USBAudio.h	Tue Mar 31 16:15:39 2015 +0100
+++ b/USBAudio/USBAudio.h	Wed Apr 08 07:46:23 2015 +0100
@@ -216,12 +216,12 @@
     /*
     * Callback called when a packet is received
     */
-    virtual bool EP3_OUT_callback();
+    virtual bool EPISO_OUT_callback();
 
     /*
     * Callback called when a packet has been sent
     */
-    virtual bool EP3_IN_callback();
+    virtual bool EPISO_IN_callback();
 
 private: