some more powerplay/pwr virus size reduction patches

[Dave Airlie]

I don't think these patches will land on the list due to size.

https://cgit.freedesktop.org/~airlied/linux/log/?h=amdgpu-non-dc-cleanups

The top 3 patches on that branch.

These reduce the size of the driver by about 60k, by redesigning the
pwrvirus upload code to use less space. I did notice the fiji and
polaris 10 across the 6 data blocks uploaded, there is only a single
bit different. So it might be possible to further merge these.

I'd really like someone from the powermangement side to take a look if
possible, it might be the one bit doesn't matter, and we could merge
these for fiji and polaris and save another 40k.

Dave.