net: bnx2x: reject unsupported coalescing params

Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.

This driver did not previously reject unsupported parameters.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c

@@ -3656,6 +3656,7 @@ static int bnx2x_get_ts_info(struct net_device *dev,
 }
 
 static const struct ethtool_ops bnx2x_ethtool_ops = {
+	.supported_coalesce_params = ETHTOOL_COALESCE_USECS,
 	.get_drvinfo		= bnx2x_get_drvinfo,
 	.get_regs_len		= bnx2x_get_regs_len,
 	.get_regs		= bnx2x_get_regs,