dt-bindings: mmc: sdhci-msm: Document SC8280XP SDHCI

Add compatible for the SDHCI block found in SC8280XP.

Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Link: https://lore.kernel.org/r/20230509030136.1524860-1-quic_bjorande@quicinc.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>