[PATCH] USB cypress_m8: line setting bugfix, circular write buffer added, misc. fixes

This patch brings up to date the driver with the current stable development
source.  A bug with RTS not raising upon first open was fixed, Al Borcher's
circular write buffer from the pl2303 driver was implemented, and various
fixes/cleanups were made.
Signed-off-by: Lonnie Mendez <lmendez19@austin.rr.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>