arm64: dts: rockchip: make dts use gpio-fan matrix instead of array

No functional changes.

Adjust to comply with dt-schema requirements
and make possible to validate values.

Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: David Heidelberg <david@ixit.cz>
Link: https://lore.kernel.org/r/20231209171653.85468-2-david@ixit.cz


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