drm/i915/display: Set and get the casf config

drm/i915/display: Set and get the casf config

Set the configuration for CASF and capture it
in crtc_state and get the configuration by
reading back. Add the support to compare the
software and hardware state of CASF.

v2: Update subject[Ankit]
v3: Add the state compare[Ankit]

Signed-off-by: Nemesa Garg <nemesa.garg@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20251028120747.3027332-9-ankit.k.nautiyal@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>