dt-bindings: samsung: exynos-sysreg: combine exynosautov920 with other enum

No need to create a new enum every time we bring-up new SoC.

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Jaewon Kim <jaewon02.kim@samsung.com>
Link: https://lore.kernel.org/r/20231210134834.43943-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>