arm64: dts: rockchip: Update powkiddy rk2023 dtsi for RGB10MAX3

Move the vdd_cpu regulator to the device specific dts. This is in
preparation of adding the Powkiddy RGB10MAX3 device, which uses
a different vendor for the CPU regulator at a different i2c address.

Also add a phandle to the bluetooth device so that we can change the
compatible string for the RGB10MAX3. This device uses the same pinouts
but a different bluetooth device.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20240212184950.52210-6-macroalpha82@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>