arm64: dts: apm: use "okay" for status

"okay" over "ok" is preferred for status property.

Link: https://lore.kernel.org/r/20230127101827.93728-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>