MAINTAINERS: Add ethtool pse-pd to PSE NETWORK DRIVER

Add net/ethtool/pse-pd.c to PSE NETWORK DRIVER to receive emails concerning
modifications to the ethtool part.
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240909114336.362174-1-kory.maincent@bootlin.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

MAINTAINERS

@@ -18407,6 +18407,7 @@ L:	netdev@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/pse-pd/
 F:	drivers/net/pse-pd/
+F:	net/ethtool/pse-pd.c
 
 PSTORE FILESYSTEM
 M:	Kees Cook <kees@kernel.org>