dt-bindings: leds: rohm,bd71828: Drop select:false

select:false makes the schema basically ignored (not selected for given
compatible), unless some other binding references it.  It's not really
useful nor needed for device bindings, even if they are part of other
binding (like MFD).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230728171123.110489-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>