ARM: dts: qcom: use "okay" for status

"okay" over "ok" is preferred:

  serial@f991f000: status:0: 'ok' is not one of ['okay', 'disabled', 'reserved']

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230127095319.64560-1-krzysztof.kozlowski@linaro.org