arm64: dts: qcom: sc8180x-primus: Allow UFS regulators load/mode setting

The UFS driver expects to be able to set load (and by extension, mode)
on the supplied regulators. Add the necessary properties to make that
possible.

Fixes: 2ce38cc1 ("arm64: dts: qcom: sc8180x: Introduce Primus")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231214-topic-sc8180_fixes-v1-6-421904863006@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>