arm64: dts: rockchip: enable NPU on rk3588-tiger

arm64: dts: rockchip: enable NPU on rk3588-tiger

Enable the NPU cores and their mmus and wire up the supply-regulator.
The regulator itself was already defined, but it does not need to be
always on - the npu can control it.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Tested-by: Quentin Schulz <quentin.schulz@cherry.de>
Link: https://patch.msgid.link/20250812085213.1071106-1-heiko@sntech.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>