staging: vt6656: mac80211 conversion: main_usb add functions and change usb_driver functions

Create new functions for the operations of mac80211
vnt_tx_80211
vnt_start
vnt_stop
vnt_add_interface
vnt_remove_interface
vnt_config
vnt_bss_info_changed
vnt_prepare_multicast
vnt_configure
vnt_set_key
vnt_sw_scan_start
vnt_sw_scan_complete
vnt_get_tsf
vnt_set_tsf
vnt_reset_tsf

Create vnt_init to call device_init_registers to get permanent mac address.
This will be linked to vt6656_probe via bScheduleCommand in another patch as
firmware needs to be loaded first.

Modify vt6656_probe, vt6656_disconnect for mac80211

Change vt6656_suspend and vt6656_resume, nothing needs to be done here
let mac80211 handle the suspend.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>