net: stmmac: Remove unused inline function stmmac_rx_threshold_count

There's no caller in-tree since
commit 2af6106ae9 ("net: stmmac: Introducing support for Page Pool")

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YueHaibing 2020-05-05 16:42:56 +08:00 • committed by David S. Miller
commit d66e67bd4c