[ Upstream commit b8cf66182eddb22e9c7539821ed6eecdb4f86d1a ]

The pfvf exchange need be in exclusive mode. And add pfvf exchange in gpu
reset.
Signed-off-by: NEmily Deng <Emily.Deng@amd.com>
Reviewed-By: NXiangliang Yu <Xiangliang.Yu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>