Removed those unused functions since we simplified the driver
by using the page pool to manage RX buffers.
Signed-off-by: NShenwei Wang <shenwei.wang@nxp.com>
Link: https://lore.kernel.org/r/20221017161236.1563975-1-shenwei.wang@nxp.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>