arm64: dts: qcom: sm8450-nagara: Configure SLG51000 PMIC

Nagara devices use the Dialog SLG51000 PMIC for powering some camera
sensors. Add the required nodes to support it.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221229103212.984324-7-konrad.dybcio@linaro.org