drm/panel-leadtek-ltk500hd1829: Fix dotclock

The currently listed dotclock disagrees with the currently
listed vrefresh rate. Change the dotclock to match the vrefresh.

Someone tell me which (if either) of the dotclock or vreresh is
correct?

Cc: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200302203452.17977-6-ville.syrjala@linux.intel.com
Tested-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Acked-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>

drivers/gpu/drm/panel/panel-leadtek-ltk500hd1829.c

@@ -377,7 +377,7 @@ static const struct drm_display_mode default_mode = {
 	.vsync_end	= 1280 + 30 + 4,
 	.vtotal		= 1280 + 30 + 4 + 12,
 	.vrefresh	= 60,
-	.clock		= 41600,
+	.clock		= 69217,
 	.width_mm	= 62,
 	.height_mm	= 110,
 };