arm64: dts: qcom: sm8350-sagami: Configure SLG51000 PMIC on PDX215

Remove the mention of this PMIC from the common DTSI, as it's not
used on PDX214. Add the required nodes to support it on PDX215.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221118152028.59312-2-konrad.dybcio@linaro.org