drm: Nuke unused drm_display_info.pixel_clock

drm_display_info.pixel_clock is unused. Let's get rid of it.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190326173401.7329-1-ville.syrjala@linux.intel.comReviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

include/drm/drm_connector.h

@@ -307,12 +307,6 @@ struct drm_display_info {
 	 */
 	unsigned int height_mm;
 
-	/**
-	 * @pixel_clock: Maximum pixel clock supported by the sink, in units of
-	 * 100Hz. This mismatches the clock in &drm_display_mode (which is in
-	 * kHZ), because that's what the EDID uses as base unit.
-	 */
-	unsigned int pixel_clock;
 	/**
 	 * @bpc: Maximum bits per color channel. Used by HDMI and DP outputs.
 	 */