Add call to setup firmware data dump structure during device load in
mlx5core.

Do not consider the inability to create a firmware dump fatal, but
inform about the situation and allow the driver to attach. The device
might not implement the needed VSC, or we might not know the layout of
the registers map. In either case, only firmware dump functionality is
limited, the network operations should be fine.

Submitted by: kib@
MFC after: 1 week
Sponsored by: Mellanox Technologies