arm64: dts: qcom: sm6125: Initial support for xiaomi-laurel-sprout

Add support for the Xiaomi Mi A3 (xiaomi-laurel-sprout). Here's a
summary on what's defined.

- dmesg output to bootloader preconfigured display
- USB
- UFS
- SD card
- SMD RPM regulators
- Volume Up, Down and Power buttons
- Thermistors

Signed-off-by: Lux Aliaga <they@mint.lgbt>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230306170817.3806-7-they@mint.lgbt