arm64: dts: qcom: sm6115: add iommu for sdhc_1

The first SDHC can do DMA like most other peripherals, add the missing
iommus entry which is required to set this up.

This may have been working on Linux before since the bootloader
configures it and it may not be full torn down. But other software like
U-Boot needs this to initialize the eMMC properly.

Fixes: 97e563bf ("arm64: dts: qcom: sm6115: Add basic soc dtsi")
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240619-rb2-fixes-v1-1-1d2b1d711969@linaro.org


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