arm64: dts: qcom: mms8996: correct slimbus children unit addresses

Correct slimbus address/size cells to match bindings.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220928152027.489543-5-krzysztof.kozlowski@linaro.org