net: pse-pd: tps23881: Add support for static port priority feature

This patch enhances PSE callbacks by introducing support for the static
port priority feature. It extends interrupt management to handle and report
detection, classification, and disconnection events. Additionally, it
introduces the pi_get_pw_req() callback, which provides information about
the power requested by the Powered Devices.

Interrupt support is essential for the proper functioning of the TPS23881
controller. Without it, after a power-on (PWON), the controller will
no longer perform detection and classification. This could lead to
potential hazards, such as connecting a non-PoE device after a PoE device,
which might result in magic smoke.

Signed-off-by: Kory Maincent (Dent Project) <kory.maincent@bootlin.com>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://patch.msgid.link/20250617-feature_poe_port_prio-v14-12-78a1a645e2ee@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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