drm/radeon/kms/pm: radeon_set_power_state fixes

- wait for vbl for both profile and dynpm
- unify profile and dynpm code paths more
- call pm_misc before of after clocks to make
sure voltage is changed in the proper order.

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