ARM: dts: rockchip: replace status value "ok" by "okay"

While the DT parser recognizes "ok" as a valid value for the
"status" property, it is actually mentioned nowhere. Use the
proper value "okay" instead, as done in the majority of files
already.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Link: https://lore.kernel.org/r/20200830190820.20583-1-freifunk@adrianschmutzler.de


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