dt-bindings: pse: tps23881: add reset-gpios

The TPS23881 has an active-low reset pin that can be connected to an
SoC.  Document this with the device-tree binding.

Signed-off-by: Kyle Swenson <kyle.swenson@est.tech>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20240822220100.3030184-2-kyle.swenson@est.tech


Signed-off-by: Jakub Kicinski <kuba@kernel.org>