No functional changes, this just gives names to some registers and USB
requests based on Grigori Goronzy's work and WinChipTech's Linux driver
(which reassuringly agree), then uses them in place of magic numbers.
This also renames the misnamed BREAK2 register (actually UART config)
Signed-off-by: NAidan Thornton <makosoft@gmail.com>
Reviewed-by: NGrigori Goronzy <greg@chown.ath.cx>
Signed-off-by: NJohan Hovold <johan@kernel.org>