display: hdmi: disable route_hdmi

prevent blank screen(out of range) when vop0 clock source to npll

Signed-off-by: bross1_kuo <bross1_kuo@asus.com>
Change-Id: I5b1cbebceaca2ed495c2bfc1c4ca209c1f957901

Author: BrossKuo

arch/arm/boot/dts/rk3288-tinker-board.dts

@@ -829,7 +829,7 @@
 };
 
 &route_hdmi {
-	status = "okay";
+	status = "disabled";
 };
 
 &pwm1 {