USB: serial: aircable.c: use module_usb_serial_driver
This converts the aircable.c driver to use the module_usb_serial_driver() call
instead of having to have a module_init/module_exit function, saving a lot
of duplicated code.
CC: Paul Gortmaker <paul.gortmaker@windriver.com> CC: Lucas De Marchi <lucas.demarchi@profusion.mobi> CC: Rusty Russell <rusty@rustcorp.com.au> CC: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>