sfc: disable RXFCS and RXALL features by default

By default we would not want RXFCS and RXALL features enabled as they are
mainly intended for debugging purposes. This does not stop users from
enabling them later on as needed.

Fixes: 8e57daf7

 ("sfc_ef100: RX path for EF100")
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Co-developed-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Martin Habets <habetsm.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>