Bluetooth: btusb: Use & instead of == to test bitflag BTUSB_IGNORE

The driver_info field is a bitmask, so use & instead of == to test the
BTUSB_IGNORE bitflag against it, which is consistent with how the other
flags are tested.

Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Zijun Hu <zijun.hu@oss.qualcomm.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>