The driver should not be sending any printk() messages when it is
loaded, as no other USB serial driver does.  This fixes that, and also
removes the useless version number from the driver.

Cc: Johan Hovold <jhovold@gmail.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Adhir Ramjiawan <adhirramjiawan0@gmail.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>