vxge: Fixed "ethtool -d" prints.

- Fixed "ethtool -d" prints
- reg_space pointer was getting over written, updating it correctly.

Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>