13975 support for higher baud rates
Reviewed by: Robert Mustacchi <rm@fingolfin.org>
Approved by: Richard Lowe <richlowe@richlowe.net>

6763764 Support for FTDI USB Serial adapters
6798921 usbser mishandles some ioctls
4696628 USB serial needs properties to ignore CD
6821751 Add support for 921600 baud

OpenSolaris Launch