Commit
057753e7f6d2b1ae5fe47835431ff0c86f2b3f2c
by Oliver Smithccid_host: remove unused _set_dtr
Fix for:
cuart_driver_tty.c:62:13: warning: '_set_dtr' defined but not used [-Wunused-function]
62 | static void _set_dtr(int fd, bool dtr)
Change-Id: I43b08a584891e94b9cfab095834e499dd5914b4f