dt-bindings: mmc: sdhci-msm: Add compatible string for sc7280

Add sc7280 SoC specific compatible strings for qcom-sdhci controller.

Signed-off-by: Shaik Sajida Bhanu <sbhanu@codeaurora.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1623835207-29462-1-git-send-email-sbhanu@codeaurora.org


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