Staging rtl8712: Remove double USB device IDs

Remove copies of the double USB device IDs:

- 0bda:8172
- 0bda:8174

Signed-off-by: Martin Krause <martin.krause@tqs.de>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>