dt-bindings: mfd: samsung,s5m8767: Simplify excluding properties

Mutually exclusive s5m8767,pmic-buck[234]-uses-gpio-dvs properties can
be written simpler, with half of the lines of code.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230619101424.25897-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Lee Jones <lee@kernel.org>