Add example for SATA3 SSD

[bhunny]

hi jetsonhacks

I'd modified your code a little for my Jetson TX2 with SATA3 SSD and It works well ! :)

I hope you merge my branch for someone looking for SATA3 version of rootOnNVMe.

Thanks.

*Tested environment Ubuntu 18.04.6 JetPack 4.6 Samsung SSD (SATA3) Jetson TX2