net/mlx5: support device removal event

net/mlx5: support device removal event

Extend the LSC event handling to support the device removal as well.

The mlx5 event handling has been made capable of receiving and
signaling several event types at once.

This support includes next:
1. Removal event detection according to the user configuration.
2. Calling to all registered mlx5 removal callbacks.
3. Capabilities extension to include removal interrupt handling.

Signed-off-by: Matan Azrad <matan@mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>