drm/i915/dp: Enable AS SDP whenever VRR is possible or PR !async

Currently AS SDP is only configured when VRR is enabled.
With optimized guardband, we also need to account for wakeup time and other
relevant details that depend on the AS SDP position whenever AS SDP is
enabled. If a feature enabling AS SDP gets turned on later (after modeset),
the guardband might not be sufficient and may need to increase, triggering
a full modeset.

Additionally, for Panel Replay with Aux-less ALPM where the sink does
not support asynchronous video timing in PR active, the source must
keep transmitting Adaptive-Sync SDPs while PR is active.

So, always send AS SDP whenever there is a possibility to use it for VRR
OR for Panel Replay for synchronization.

v2: Check if AS SDP can be used for synchronization for VRR or PR. (Ville)
v3: Use intel_psr_needs_alpm_aux_less() instead of
    intel_alpm_is_alpm_aux_less() to avoid including the LOBF case. (Ville)
    Modify the commit message and subject.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260527041050.601735-12-ankit.k.nautiyal@intel.com

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