drm/i915/psr: Use ->get_aux_send_ctl functions

I just wanted to get rid of the rmw cycle for gen9, but this also
fixes some bugs we haven't carried over, like using recommended
precharge and timeout values.

Also I noticed that we don't set the fastwake sync length on skl, and
that's used by PSR2 selective updates. Fix that.

Cc: Rodrigo Vivi <[email protected]>
Cc: Sonika Jindal <[email protected]>
Cc: Durgadoss R <[email protected]>
Cc: "Pandiyan, Dhinakaran" <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Tested-by: Ville Syrjälä <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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