drm/i915/dsi: don't debug log "missing" sequences

This is not interesting. They are not "missing", they are just not part
of the VBT sequences for the panel.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/54909b29802398d23f1d26f6589671e69688f904.1474286487.git.jani.nikula@intel.com

drivers/gpu/drm/i915/intel_dsi_panel_vbt.c

@@ -385,11 +385,8 @@ static void generic_exec_sequence(struct drm_panel *panel, enum mipi_seq seq_id)
 		return;
 
 	data = dev_priv->vbt.dsi.sequence[seq_id];
-	if (!data) {
-		DRM_DEBUG_KMS("MIPI sequence %d - %s not available\n",
-			      seq_id, sequence_name(seq_id));
+	if (!data)
 		return;
-	}
 
 	WARN_ON(*data != seq_id);