Rework TTMs busy handling

[Christian König]

Am 12.01.24 um 13:51 schrieb Christian König:
> Hi guys,

just a gentle ping on this.

Zack any more comments for the VMWGFX parts?

Thanks,
Christian.

>
> same as the last time. Things I've changed:
>
> Implemented the requirements from Zack to correctly fill in the busy
> placements for VMWGFX.
>
> Renamed the placement flags to desired and fallback as suggested by
> Michel.
>
> Rebased on drm-tip instead of drm-misc-next and fixed XE as well.
>
> Please review and comment,
> Christian.
>
>