drm/edid: Clear the old hdmi info before parsing display info

The current EDID might not support advanced HDMI 2.0 features.
Leaving old hdmi info in the drm_display_info will make display
work not okay, when switching display from HDMI 2.0 device to
HDMI 1.4 device.

Change-Id: Ifaf11a115580a93ec00160d54f0d453842d7b484
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>

Author: Zheng Yang

drivers/gpu/drm/drm_edid.c

@@ -4212,6 +4212,8 @@ static void drm_add_display_info(struct drm_connector *connector,
 	info->max_tmds_clock = 0;
 	info->dvi_dual = false;
 
+	memset(&info->hdmi, 0, sizeof(info->hdmi));
+
 	if (edid->revision < 3)
 		return;