arm64: dts: qcom: qcs404: Fix sdhci compat string

As per the bindings, the SDHCI controller should have a SoC-specific
compatible string in addition to the generic version-based one.  Add
it.

Reviewed-by: Vinod Koul <vkoul@kernel.org>
Fixes: 7241ab94 ("arm64: dts: qcom: qcs404: Add sdcc1 node")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20200127082331.1.I402470e4a162d69fde47ee2ea708b15bde9751f9@changeid


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>