Adding mbed_opta to architecture.

Author: aliphys

library.properties

@@ -6,5 +6,5 @@ sentence=Simplify cross-device storage management on Portenta platforms with a s
 paragraph=With this versatile library, you can seamlessly handle various storage types without the need for separate, device-specific libraries. Develop data logging, file storage, or data transfer applications, with a consistent interface. All while reducing development time and ensuring compatibility across the Portenta C33, Portenta H7, and Portenta Machine Control platforms.
 category=Data Storage
 url=https://github.com/arduino-libraries/Arduino_UnifiedStorage
-architectures=renesas_portenta,mbed_portenta
+architectures=renesas_portenta,mbed_portenta, mbed_opta
 includes=Arduino_UnifiedStorage.h