ARM: dts: rockchip: remove identical #include from rk3288.dtsi

There are 2 identical '#include' for 'rk3288-power.h',
so remove one of them.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20200403180159.13387-1-jbx6244@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288.dtsi

@@ -7,7 +7,6 @@
 #include <dt-bindings/clock/rk3288-cru.h>
 #include <dt-bindings/power/rk3288-power.h>
 #include <dt-bindings/thermal/thermal.h>
-#include <dt-bindings/power/rk3288-power.h>
 #include <dt-bindings/soc/rockchip,boot-mode.h>
 
 / {