MAINTAINERS: mark wusbcore and UWB as obsolete

Joe rightly points out that we should be using the "Obsolete" status for
these two subsystems.

Also I got the path name wrong for the wusbcore tree.

Reported-by: Joe Perches <joe@perches.com>
Fixes: 71ed79b0 ("USB: Move wusbcore and UWB to staging as it is obsolete")
Link: https://lore.kernel.org/r/20190808092509.GA20173@kroah.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>