Enable NVIDIA Persistence Daemon by default

[SreeeS]

Summary

This PR is to enable NVIDIA Persistence Daemon by default

Implementation details

Added sudo systemctl enable nvidia-persistenced to scripts/enable-ecs-agent-gpu-support.sh

Testing

• REGION=us-west-2 make al2gpu
• Launch instance with test AMI and verify nvidia-persistenced.service is enabled, active (running)

systemctl status nvidia-persistenced
● nvidia-persistenced.service - NVIDIA Persistence Daemon
   Loaded: loaded (/usr/lib/systemd/system/nvidia-persistenced.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2023-09-26 04:07:02 UTC; 1min 7s ago
 Main PID: 4705 (nvidia-persiste)
    Tasks: 1
   Memory: 28.1M
   CGroup: /system.slice/nvidia-persistenced.service
           └─4705 /usr/bin/nvidia-persistenced --verbose

• Run functional set suite against the AMIs created and verify exec tests succeed

New tests cover the changes: No new tests added

Description for the changelog

Enable NVIDIA Persistence Daemon by default

Licensing

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.