dt-bindings: pse-pd: ti,tps23881: Add TPS23881B

Add the TPS23881B I2C power sourcing equipment controller to the list of
supported devices.

Falling back to the TPS23881 predecessor device is not suitable as firmware
loading needs to handled differently by the driver. The TPS23881 and
TPS23881B devices require different firmware. Trying to load the TPS23881
firmware on a TPS23881B device fails and must therefore be omitted.

Signed-off-by: Thomas Wismer <thomas.wismer@scs.ch>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20251029212312.108749-3-thomas@wismer.xyz
Signed-off-by: Jakub Kicinski <kuba@kernel.org>