drm/i915/alpm: Move the check for PSR and Fixed RR in compute_config_late

With optimized guardband, we need to take into account LOBF requirements
via intel_alpm_lobf_min_guardband().

Currently, we set has_lobf based not only on whether it is supported, but
also on whether PSR/fixed RR are ON. Since these features can switch ON and
OFF seamlessly, this may cause LOBF to change, resulting in a change in
guardband requirements, and eventually to a full modeset.

To avoid this, always account for LOBF if it is supported, in the
encoder->compute_config() stage. For this, allow has_lobf to be set
irrespective of PSR/Fixed RR. Later, in the encoder->compute_config_late()
stage, use the PSR/Fixed RR checks to set has_lobf to the final value.

Move the PSR/Fixed RR checks from intel_alpm_lobf_compute_config() to
intel_alpm_lobf_compute_config_late(), where we already account for other
LOBF constraints.

v2: Reset has_lobf if psr or VRR is ON in
    intel_alpm_lobf_compute_config_late(). (Animesh)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patch.msgid.link/20260616080627.2136659-1-ankit.k.nautiyal@intel.com

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