After commit ec51fbd1 ("r8152: add USB device driver for
config selection"), the code about changing USB configuration
in rtl_vendor_mode() wouldn't be run anymore. Therefore, the
function could be removed.
Signed-off-by: NHayes Wang <hayeswang@realtek.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>