drm/i915: Add SIZE_HINTS property for cursors

Advertize more suitable cursor sizes via the new SIZE_HINTS
plane property.

We can't really enumerate all supported cursor sizes on
the platforms where the cursor height can vary freely, so
for simplicity we'll just expose all square+POT sizes between
each platform's min and max cursor limits.

Depending on the platform this will give us one of three
results:
- 64x64,128x128,256x256,512x512
- 64x64,128x128,256x256
- 64x64

Cc: Simon Ser <[email protected]>
Cc: Jonas Ådahl <[email protected]>
Cc: Daniel Stone <[email protected]>
Cc: Sameer Lattannavar <[email protected]>
Cc: Sebastian Wick <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Pekka Paalanen <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Juha-Pekka Heikkila <[email protected]>

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