arm64: dts: qcom: sm8250-xiaomi-elish-csot: Add Xiaomi Mi Pad 5 Pro CSOT variant

Add support for the Xiaomi Mi Pad 5 Pro CSOT variant. The CSOT variant
uses China Star Optoelectronics Technology (CSOT) panel based on NT36523
display controller.

Signed-off-by: Jianhua Lu <lujianhua000@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230323005925.23179-3-lujianhua000@gmail.com