net/ncsi: update response packet length for GCPS/GNS/GNPTS commands

Update response packet length for the following commands per NC-SI spec
- Get Controller Packet Statistics
- Get NC-SI Statistics
- Get NC-SI Pass-through Statistics command

Signed-off-by: Ben Wei <benwei@fb.com>
Reviewed-by: Justin Lee <justin.lee1@dell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>