drm/i915/pps: include panel power cycle delay in debugfs

The debugfs contains all the other timings except panel power cycle
delay. Add it for completeness.

Tested-by: Paul Menzel <pmenzel@molgen.mpg.de> # Dell XPS 13 9360
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241205123720.3278727-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Author: jnikula

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

@@ -1820,6 +1820,8 @@ static int intel_pps_show(struct seq_file *m, void *data)
 		   intel_dp->pps.panel_power_up_delay);
 	seq_printf(m, "Panel power down delay: %d\n",
 		   intel_dp->pps.panel_power_down_delay);
+	seq_printf(m, "Panel power cycle delay: %d\n",
+		   intel_dp->pps.panel_power_cycle_delay);
 	seq_printf(m, "Backlight on delay: %d\n",
 		   intel_dp->pps.backlight_on_delay);
 	seq_printf(m, "Backlight off delay: %d\n",