arm64: add support for vCPU SVE feature

[xuejun-xj]

Summary of the PR

This commit add support for initialization of vCPU SVE feature on aarch64:

1. Add ArmSve in Cap struct.
2. Add KVM_ARM_VCPU_FINALIZE ioctl in VcpuFd struct, which is used to initialize the finalization of SVE feature for now.

[xuejun-xj]

Hi! This PR adds support for vcpu finalize ioctl. It is used to initialize SVE extention for guest vcpu. Is there anyone help to review this PR?

[jiangliu]

Please also help to change the "CHANGELOG.md" file.

[xuejun-xj]

Please also help to change the "CHANGELOG.md" file.

@jiangliu Thanks for reminder. I have added it in another commit.

[roypat]

Hi @xuejun-xj could you have a look at resolving the conflicts so we can try getting merge before the next release? :o

[xuejun-xj]

Hi @xuejun-xj could you have a look at resolving the conflicts so we can try getting merge before the next release? :o

Thanks, @roypat ! I have found something strange that I have already resolved the conflict and force-pushed to original branch. But this PR page seems nothing changed? It still shows the "Resolve conflicts" button.

[roypat]

This is indeed weird - I've seen it happen a few times across different repositories the last few days, so I think GitHub is having some problems recently. Can you try closing this PR and opening a new one from the same branch? That usually fixes it for me 🤔

[xuejun-xj]

This is indeed weird - I've seen it happen a few times across different repositories the last few days, so I think GitHub is having some problems recently. Can you try closing this PR and opening a new one from the same branch? That usually fixes it for me 🤔

Ok, I will open another PR for #228 .