drm/i915/cnp: Introduce Cannonpoint PCH.
Most of south engine display that is in PCH is still the same as SPT and KBP, except for this key differences: - Backlight: Backlight programming changed in CNP PCH. - Panel Power: Sligh programming changed in CNP PCH. - GMBUS and GPIO: The pin mapping has changed in CNP PCH. All of these changes follow more the BXT style. v2: Update definition to use dev_priv isntead of dev (Tvrtko). Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1496434004-29812-1-git-send-email-rodrigo.vivi@intel.com
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