drm/i915/skl: Provide a Skylake version of get_plane_config()
drm/i915/skl: Provide a Skylake version of get_plane_config()

Universal planes have changed a bit the register organization.

v2: Rebase on top of the latest drm-intel-nightly

v3: Use PLANE_SIZE to retrieve the fb size (Tvrtko)
    Don't use BUG() (Tvrtko)

v4: Use MISSING_CASE (Daniel)

Reviewed-By: Tvrtko Ursulin <82325a91373a06cdf12f953d4611ffb7756aa8d4@intel.com>
Signed-off-by: Damien Lespiau <64bd3cb94f359c1a3ce68dae5e26b40578526277@intel.com>
Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs