net: hns3: refactor hns3_nic_reuse_page()

[ Upstream commit e74a726d ]

Split rx copybreak handle into a separate function from function
hns3_nic_reuse_page() to improve code simplicity.

Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 7d89b53c ("net: hns3: fix miss L3E checking for rx packet")
Signed-off-by: Sasha Levin <sashal@kernel.org>