drm/i915/dsb: Use safe window path when VRR TG is used

When the VRR timing generator is always used, the hardware behaves
as VRR-active regardless of crtc_state->vrr.enable.

The DSB paths that depend on the VRR safe window therefore need to follow
the VRR code paths in that case too:
- dsb_chicken(): program the SAFE_WINDOW chicken bits,
- intel_dsb_vblank_evade(): use vmin/vmax vblank starts for the
  wait window,
- intel_dsb_wait_for_delayed_vblank(): wait inside the vmin safe window
  before the scanline-based delayed vblank wait.

Introduce helper pre_commit_use_safe_window() and use it in the three sites

v2: Instead of modifying pre_commit_is_vrr_active() use a new helper and
    use it only in the required places. (Ville).

v3: -Keep using pre_commit_is_vrr_active() for DCB path. (Ville)
    -Add a separate check for fixed RR with VRR TG and use
     fixed mode vblank start there. (Ville)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260617051417.2223526-1-ankit.k.nautiyal@intel.com

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