net: txgbe: move interrupt codes to a separate file

[ Upstream commit 63aabc3e ]

In order to change the interrupt response structure, there will be a
lot of code added next. Move these interrupt codes to a new file, to
make the codes cleaner.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 1d3c6414 ("net: txgbe: fix to control VLAN strip")
Signed-off-by: Sasha Levin <sashal@kernel.org>