drm/radeon/si_dpm: workaround for SI kickers

commit 7dc86ef5 upstream.

Consolidate existing quirks. Fixes stability issues
on some kickers.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>