USB: serial: oti6858: simplify init_termios

Simplify init_termios which is only used to override the initial
baudrate.

Signed-off-by: Johan Hovold <johan@kernel.org>
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c
index ae9cb15..38ae0fc 100644
--- a/drivers/usb/serial/oti6858.c
+++ b/drivers/usb/serial/oti6858.c
@@ -393,10 +393,7 @@
 
 static void oti6858_init_termios(struct tty_struct *tty)
 {
-	tty->termios = tty_std_termios;
-	tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
-	tty->termios.c_ispeed = 38400;
-	tty->termios.c_ospeed = 38400;
+	tty_encode_baud_rate(tty, 38400, 38400);
 }
 
 static void oti6858_set_termios(struct tty_struct *tty,