drm/i915/dp: remove accidental static on what should be a local variable

The variable should obviously be local, not static.

Fixes: a421d8a9 ("drm/i915/dp: rewrite DP 2.0 128b/132b link training based on errata")
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220217083938.3587465-1-jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_dp_link_training.c

@@ -1408,7 +1408,7 @@ intel_dp_128b132b_link_train(struct intel_dp *intel_dp,
 void intel_dp_start_link_train(struct intel_dp *intel_dp,
 			       const struct intel_crtc_state *crtc_state)
 {
-	static bool passed;
+	bool passed;
 	/*
 	 * TODO: Reiniting LTTPRs here won't be needed once proper connector
 	 * HW state readout is added.