dt-bindings: memory-controllers: samsung,exynos4210-srom: Enforce child props

dt-bindings: memory-controllers: samsung,exynos4210-srom: Enforce child props

Samsung Exynos SROM 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: 67bf606fcf18 ("dt-bindings: memory-controllers: samsung,exynos4210-srom: Split out child node properties")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250306085849.32852-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>