arm64: dts: rockchip: Fix rk3399 GICv3 ITS node name

The GICv3 ITS is an MSI controller, therefore its node name should be
'msi-controller'.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230207234750.202154-1-robh@kernel.org


Signed-off-by: Heiko Stuebner <heiko@sntech.de>