dt-bindings: ufs: qcom,ufs: convert to dtschema

Convert the Qualcomm Universal Flash Storage (UFS) Controller to DT
schema format.

Except the conversion, add also properties already present in DTS:
iommus, interconnects and power-domains.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220306111125.116455-6-krzysztof.kozlowski@canonical.com