<fix>[vm]: update device_letter_config value for aarch64
<fix>[vm]: update device_letter_config value for aarch64

Resolves: ZSTAC-49186

Change-Id: I74767862737a786c79746f6a6f706772646c6679

zstackio/zstack-utility,zstackio/zstack-utility,zstackio/zstack-utility