linux-phytec-ti

drm/radeon/kms: use helper functions for fence read/write

The existing code assumed scratch registers in a number
of places while in most cases we are be using writeback
and events rather than scratch registers.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>