arm64: dts: rockchip: add rk356x gpio debounce clocks

The rk356x added a debounce clock to the gpio devices. This clock is
necessary for the new v2 gpio driver to bind.
Add the clocks to the rk356x device tree.

Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Link: https://lore.kernel.org/r/20210728180034.717953-4-pgwipeout@gmail.com


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