drm/i915/vrr: Allow fixed_rr with pipe joiner

VRR with joiner is currently disabled as it still needs some work to
correctly sequence the primary and secondary transcoders. However, we can
still use VRR Timing generator in fixed refresh rate for joiner and since
it just need to program vrr timings once and does not involve changing
timings on the fly. We still need to skip the VRR and LRR for joiner.

To achieve this set vrr.in_range to 0 for joiner case, so that we do not
try VRR and LRR for the joiner case.

v2: Avoid checks for secondary pipes, where not required. (Ville)
v3: Remove a redundant check and reset vrr.in_range to false. (Ville)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://lore.kernel.org/r/20250324133248.4071909-13-ankit.k.nautiyal@intel.com

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