Wrong format of Serial Number String Characteristic in Device Information Service

[thalionath]

In nRF Connect v3.3.1 BLE the Serial Number String Characteristic of the standard Device Information Service is displayed as byte dump instead of a UTF8 string as specified by the standard.

As a quick fix, I added it to uuid_definitions.json

{
     "uuid16bitCharacteristicDefinitions": {
           "2A25": {
              "name": "Serial Number String",
              "format": "TEXT"
           }
     }
}