dt-bindings: memory-controllers: qcom,ebi2: Enforce child props

dt-bindings: memory-controllers: qcom,ebi2: Enforce child props

Qualcomm EBI2 peripheral properties were moved from the device schema to
separate "peripheral-props" schema for child node, but the device schema
does not reference the new one.

Reference the peripheral-props schema so the child nodes will be
properly validated from the device schema.

Fixes: 06652f348f28 ("dt-bindings: memory-controllers: qcom,ebi2: Split out child node properties")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250306085849.32852-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>