ixgbe: enable extremely low latency

Status from this message: Applied.

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#	Subject and files	Size	Replies	Applied
1/2	ixgbe: enable extremely low latency`drivers/net/ixgbe/ixgbe_ethtool.c` `drivers/net/ixgbe/ixgbe_main.c`	+87 -9	1 reply
2/2	ixgbe: fix bug when EITR=0 causing no writebacks`drivers/net/ixgbe/ixgbe_ethtool.c` `drivers/net/ixgbe/ixgbe_main.c`	+26 ~~-14~~	1 reply

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