ARM: dts: qcom: ipq4019: add dedicated SDHCI compatible

Add dedicated compatible for the SDHCI MMC controller, because usage of
generic qcom,sdhci-msm-v4 compatible alone is deprecated.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231211085830.25380-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>