MAINTAINERS: Drop myself as maintainer of TYPEC port controller drivers

I am no longer involved in Type-C development and not really current on its
status and progress. Recently I have been doing more damage than good.
It is time to go.

Cc: Heikki Krogerus <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

MAINTAINERS

···
 F:	drivers/usb/typec/mux/pi3usb30532.c
 
 USB TYPEC PORT CONTROLLER DRIVERS
-M:	Guenter Roeck <[e-mail]>
 L:	[e-mail]
-S:	Maintained
+S:	Orphan
 F:	drivers/usb/typec/tcpm/
 
 USB UHCI DRIVER