drm/amd/powerplay: expose max engine and memory clock info for powerplay enabled case

[Quan, Evan]

Hi All,

We found the max engine clock and max memory clock are both wrongly reported as 0(by AMDGPU_INFO_DEV_INFO ioctl).
The attached patch tries to fix it.
Please help to review it.
Any comment is welcomed.

Regards,
Evan
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