drm/amdgpu: rename context priority levels

Don't leak implementation details about how each priority behaves to
usermode. This allows greater flexibility in the future.

Squash into c2636dc53abd8269a0930bccd564f2f195dba729

Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2 files changed