drm/i915/gen9: Avoid using negative array index in skl_update_plane()

scaler_id may be negative as shown by conditions later in the function,
so don't use it as an array index in that case.

v2:
- Remove ps_ctrl while at it (Ville).

Signed-off-by: Imre Deak <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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