drm/i915: Clear the shared PLL from the put_dplls() hook

For symmetry with the get_dplls() hook which sets the shared_dpll
pointer clear the same pointer from the put_dplls() hook.

While at it also constify the old crtc state.

v2:
- Constify the old crtc state. (Ville)

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

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