USB: Fix up terminology

USB is a HOST/DEVICE protocol, as per the specification and all
documentation.  Fix up terms that are not applicable to make things
match up with the terms used through the rest of the USB stack.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Felipe Balbi <balbi@kernel.org>
Link: https://lore.kernel.org/r/20200630174123.GA1906678@kroah.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/ftdi_sio.h

@@ -302,7 +302,7 @@ enum ftdi_sio_baudrate {
 /*
  * FTDI_SIO_GET_LATENCY_TIMER
  *
- * Set the timeout interval. The FTDI collects data from the slave
+ * Set the timeout interval. The FTDI collects data from the
  * device, transmitting it to the host when either A) 62 bytes are
  * received, or B) the timeout interval has elapsed and the buffer
  * contains at least 1 byte.  Setting this value to a small number
@@ -324,7 +324,7 @@ enum ftdi_sio_baudrate {
 /*
  * FTDI_SIO_SET_LATENCY_TIMER
  *
- * Set the timeout interval. The FTDI collects data from the slave
+ * Set the timeout interval. The FTDI collects data from the
  * device, transmitting it to the host when either A) 62 bytes are
  * received, or B) the timeout interval has elapsed and the buffer
  * contains at least 1 byte.  Setting this value to a small number