Add proper print in case of 0x0 health syndrome in mlx5core.

In case of health counter fails to increment it indicates a bad device health.
In case when the syndrome indicated by firmware is 0x0, this indicates that
firmware is unable to respond to initialization segment reads.
Add proper print in this case.

Submitted by: slavash@
MFC after: 3 days
Sponsored by: Mellanox Technologies