sfc: remove unused variable 'efx_default_channel_type'

drivers/net/ethernet/sfc/efx.c:116:38: warning:
 efx_default_channel_type defined but not used [-Wunused-const-variable=]

commit 83975485 ("sfc: move channel alloc/removal code")
left behind this, remove it.
Reported-by: NHulk Robot <hulkci@huawei.com>
Fixes: 83975485 ("sfc: move channel alloc/removal code")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Acked-by: NMartin Habets <mhabets@solarflare.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/efx.c

@@ -113,7 +113,6 @@ MODULE_PARM_DESC(debug, "Bitmapped debugging message enable value");
  *
  *************************************************************************/
 
-static const struct efx_channel_type efx_default_channel_type;
 static void efx_remove_port(struct efx_nic *efx);
 static int efx_xdp_setup_prog(struct efx_nic *efx, struct bpf_prog *prog);
 static int efx_xdp(struct net_device *dev, struct netdev_bpf *xdp);