arm64: dts: qcom: msm8996: correct UFS compatible

The Qualcomm UFS bindings require to use specific (qcom,msm8996-ufshc)
and generic (jedec,ufs-2.0) compatibles.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220407092725.232463-2-krzysztof.kozlowski@linaro.org