arm64: dts: qcom: qrb5165-rb5: correct vdc_3v3 regulator

vdc_3v3 regulator is sourced from 12V, but it is controlled by l11c
regulator, so set it as vin for vdc_3v3.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>