Add 9.2mhz uart clock support
Add 9.2mhz uart clock support

Because the 1634 isn't spec'ed for 11 @3.3v
SpenceKonde/arduino-tiny-841,SpenceKonde/arduino-tiny-841,nickiaconis/arduino-tiny-841,nickiaconis/arduino-tiny-841,nickiaconis/arduino-tiny-841,SpenceKonde/arduino-tiny-841