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drm/i915: introduce crtc->dspaddr_offset
To avoid recomputing the display framebuffer offset on gen2/3
pageflips. This is also prep work to do similar trickery on gen4+
Also:
- kill "Start", such upper-case remnants from the ddx must surely die.
- rename "Offset" to linear_offset, to make it clearer that on gen4+
this is only used by the hw for linear buffers, for tiled buffers it
uses the TILEOFF register.
- call DSAPADDR DSPLINOFF on gen4+ for the same reason (and because
the documentation really renamed the register).
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>