drm/i915/skl: Update watermarks for Y tiling

drm/i915/skl: Update watermarks for Y tiling

Display watermarks need different programming for different tiling
modes.

Set the relevant flag so this happens during the plane commit and
add relevant data into a structure made available to the watermark
computation code.

v2: Pass in tiling info to sprite plane updates as well.
v3: Rebased for plane handling changes.
v4: Handle fb == NULL when plane is disabled.
v5: Refactored for addfb2 interface.
v6: Refactored for fb modifier changes.
v7: Updated for atomic commit by only updating watermarks when tiling changes.
v8: BSpec watermark calculation updates.
v9: Restrict scope of y_tile_minimum variable. (Damien Lespiau)
v10: Get fb from plane state otherwise we are working on old state.

Signed-off-by: Tvrtko Ursulin <[email protected]>
Acked-by: Ander Conselvan de Oliveira <[email protected]>
Acked-by: Matt Roper <[email protected]>
Reviewed-by: Damien Lespiau <[email protected]> (v9)
Signed-off-by: Daniel Vetter <[email protected]>