[Target] Fix Jetson AGX Xavier CPU core count

[mshr-h]

It has 8 cores.
NVIDIA Jetson AGX Xavier Delivers 32 TeraOps for New Era of AI in Robotics | NVIDIA Technical Blog

cc @junrushao @zxybazh

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[zxybazh]

Thanks for noticing the subtle difference! I don't have hands on experience with Jetson AGX Xavier but I did find something related here in the disscussion. Can you please confirm if the core number can be specified or changed? In that case we might want to leave the target host to users to specify.

[zxybazh]

@tvm-bot rerun

[mshr-h]

Thanks.

Thanks for noticing the subtle difference! I don't have hands on experience with Jetson AGX Xavier but I did find something related here in the disscussion. Can you please confirm if the core number can be specified or changed? In that case we might want to leave the target host to users to specify.

Online core count changes based on the power configuration.
https://jetsonhacks.com/2018/10/07/nvpmodel-nvidia-jetson-agx-xavier-developer-kit/