Add Opta to supported architectures

Author: manchoz

library.properties

@@ -6,4 +6,4 @@ sentence=ARM Mbed5 USBHOST library port for Arduino.
 paragraph=This library contains an Arduino port for the ARM Mbed5 USBHost library for STM32H747 based boards.
 category=Communication
 url=https://github.com/arduino-libraries/Arduino_USBHostMbed5
-architectures=mbed,mbed_portenta,mbed_giga
+architectures=mbed,mbed_portenta,mbed_giga,mbed_opta