arm64: dts: qcom: sm8250-xiaomi-elish-csot: fix panel compatible

The bindings expect "novatek,nt36523" fallback in the panel compatible:

  sm8250-xiaomi-elish-csot.dtb: panel@0: compatible: ['xiaomi,elish-csot-nt36523'] is too short

Fixes: 8a786036 ("arm64: dts: qcom: sm8250-xiaomi-elish-csot: Add Xiaomi Mi Pad 5 Pro CSOT variant")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230408130809.52319-2-krzysztof.kozlowski@linaro.org