ARM: dts: rockchip: add QoS register compatibles for rk3066/rk3188

ARM: dts: rockchip: add QoS register compatibles for rk3066/rk3188

With the conversion of syscon.yaml minItems for compatibles
was set to 2. Current Rockchip dtsi files only use "syscon" for
QoS registers. Add Rockchip QoS compatibles for rk3066/rk3188
to reduce notifications produced with:

make ARCH=arm dtbs_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/mfd/syscon.yaml

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20201206103711.7465-1-jbx6244@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>