dt-bindings: interconnect: samsung,exynos-bus: allow opp-table

The opp-table can be located in the exynos-bus node which uses it, so
allow such child node.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230125090849.122189-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Georgi Djakov <djakov@kernel.org>