arm64: dts: qcom: msm8998-oneplus-common: enable RRADC

Enable the Round Robin ADC for the OnePlus 5/5T.

Signed-off-by: Jami Kettunen <jami.kettunen@somainline.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221016180330.1912214-6-caleb.connolly@linaro.org