drm/i915/skl: Definition of SKL WM param structs for pipe/plane

This patch defines the structures needed for computation of
watermarks of pipes and planes for SKL.

v2: Incorporated Damien's review comments and removed unused fields
    in structs for future features like rotation, drrs and scaling.
    The skl_wm_values struct is now made more generic across planes
    and cursor planes for all pipes.

v3: implemented the plane/cursor split.

v4: Change the wm union back to a structure (Ville, Daniel)

Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: Pradeep Bhat <[email protected]>
Signed-off-by: Damien Lespiau <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

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