arm64: dts: rockchip: include opp dtsi for rk3399 firefly

Add opp tables for cpu cluster0 and cluster1 by including
rk3399-opp.dtsi.
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-firefly.dts

@@ -43,6 +43,7 @@
 /dts-v1/;
 #include <dt-bindings/pwm/pwm.h>
 #include "rk3399.dtsi"
+#include "rk3399-opp.dtsi"
 
 / {
 	model = "Firefly-RK3399 Board";