Convert the Qualcomm Shared Memory Driver bindings to DT Schema.

Changes against original bindings: enforce only specific names of child
nodes, instead of any names.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220401201035.189106-9-krzysztof.kozlowski@linaro.org