v3: completely rewritten. We now just remember which areas
    of the PT to clear and do so on the next command submission.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=79980Signed-off-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>