drm/i915/panel: Split VRR vs. fixed refresh rate fixed mode selection into separate stages

Split the VRR vs. fixed refresh rate fixed mode selection into two
completely separate stages. First try the VRR method, which will
only accept fixed modes that are in the VRR range and whose refresh
rate is equal or higher to the user's requested mode's refresh rate.
If the VRR method doesn't find anything we fall back to the fixed
refresh rate method of simply looking for the fixed mode with the
closest refresh rate to the user's request.

The main benefit is that we will only perform the VRR vtotal adjustment
on fixed modes that have equal or higher refresh rate to the user's
requested mode, thus we will never end up in a situation where we'd
have to shrink the fixed mode's vtotal. This avoids any risk of ending
up with a vtotal that is too short.

v2: Drop redundant intel_panel_fixed_mode() call (Ankit)

Cc: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260623114035.7185-1-ville.syrjala@linux.intel.com
Tested-by: Vidya Srinivas <vidya.srinivas@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>

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