arm64: dts: qcom: sm8450-qrd: add SDHCI for microSD

Based on downstream DTS, it seems that SM8450 QRD has microSD card slot.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221026200357.391635-5-krzysztof.kozlowski@linaro.org