netpoll: move netpoll_send_skb() out of line

[ Upstream commit fb1eee476b0d3be3e58dac1a3a96f726c6278bed ]

There is no need to inline this helper, as we intend to add more
code in this function.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 505ead7ab77f ("netpoll: hold rcu read lock in __netpoll_send_skb()")
Signed-off-by: Sasha Levin <sashal@kernel.org>