arm64: dts: qcom: Add initial PM2250 device tree

Introduce an initial device tree for the PM2250 (sometimes known as
PM4125) PMIC.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230403-topic-rb1_qcm-v2-4-dae06f8830dc@linaro.org