etnaviv: Move halti determination to drm
What does this MR do and why?
etnaviv: Move halti determination to drm
The ideal place to store the halti value is in struct etna_core_info.
Let's put it there and the determination of it into etna_gpu_new(..).
This makes it possible to reuse the halti level outside of gallium.
Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>