octeontx2-af: Don't enable Pause frames by default

[ Upstream commit d957b51f ]

Current implementation is such that 802.3x pause frames are
enabled by default.  As CGX and RPM blocks support PFC
(priority flow control) also, instead of driver enabling one
between them enable them upon request from PF or its VFs.
Also add support to disable pause frames in driver unbind.

Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: a0d9528f ("octeontx2-af: Always configure NIX TX link credits based on max frame size")
Signed-off-by: Sasha Levin <sashal@kernel.org>