staging: vt6656: wcmd remove unused commands

WLAN_CMD_CHANGE_BBSENSITIVITY and WLAN_CMD_MAC_DISPOWERSAVING
are already implemented and don't need the command timer.

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