MAINTAINERS: Add myself to pse networking maintainer

As I add support for PoE in PSE networking subsystem it seems legitimate
to be added to the maintainers.

Reviewed-by: Andrew Lunn <[e-mail]>
Signed-off-by: Kory Maincent <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

MAINTAINERS

···
 
 PSE NETWORK DRIVER
 M:	Oleksij Rempel <[e-mail]>
+M:	Kory Maincent <[e-mail]>
 L:	[e-mail]
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/pse-pd/