staging: fsl-dpaa2/eth: Always call napi_gro_receive()

The function itself checks whether GRO support is enabled
and acts accordingly, so we don't need to verify it in the
driver as well.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>