sfc: remove duplicated include from efx.c

Remove duplicated include.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/efx.c

@@ -27,7 +27,6 @@
 #include "efx_channels.h"
 #include "rx_common.h"
 #include "tx_common.h"
-#include "rx_common.h"
 #include "nic.h"
 #include "io.h"
 #include "selftest.h"