arm64: dts: rockchip: add timer0 clocks on rk3368

The timer driver requires pclk and sclk clocks
to be present in the device tree node, so add them.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Link: https://lore.kernel.org/r/20210506111136.3941-2-ezequiel@collabora.com


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