drm/i915/display: Enable/disable casf

drm/i915/display: Enable/disable casf

Call intel_casf_enable and intel_casf_disable
in atomic commit path to enable and disable casf.
Call intel_casf_update_strength to only update
the desired strength value.

v2: Introduce casf_enable here.[Ankit]
v3: Use is_disabling in casf_disabling.[Ankit]
v4: Swap old_state and new_state param.[Ankit]
v5: In disable fn move win_sz after sharpness_ctl.
v6: Rebase and update commit message.

Signed-off-by: Nemesa Garg <nemesa.garg@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20251028120747.3027332-10-ankit.k.nautiyal@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>