arm64: dts: qcom: sm6350: Add MPSS nodes

Add the required nodes for booting the MPSS on sm6350.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211213082208.21492-4-luca.weiss@fairphone.com