dt-bindings: mfd: stericsson,db8500-prcmu: Add missing unevaluatedProperties for each regulator

Each regulator node, which references common regulator.yaml schema,
should disallow additional or unevaluated properties.  Otherwise
mistakes in properties will go unnoticed.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230726065633.74924-2-krzysztof.kozlowski@linaro.org


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