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.

Based on https://lore.kernel.org/r/20231214-topic-sc8180_fixes-v1-6-421904863006@linaro.orgSigned-off-by: Anton Bambura <jenneron@postmarketos.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240203191200.99185-7-jenneron@postmarketos.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>