net/mlx5: Wait for inactive autogroups

[ Upstream commit 49c0355d301b4e0e01e0f19ddbb023bd7d0ee48c ]

Currently, if one thread tries to add an entry to an autogrouped table
with no free matching group, while another thread is in the process of
creating a new matching autogroup, it doesn't wait for the new group
creation, and creates an unnecessary new autogroup.

Instead of skipping inactive, wait on the write lock of those groups.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Stable-dep-of: 8ec40e3f1f72 ("net/mlx5: Fix return value when searching for existing flow group")
Signed-off-by: Sasha Levin <sashal@kernel.org>