This is the fourth batch of updates to the ftgmac100 driver. This is a bunch of misc cleanups and fixes, such as properly disabling HW checksum generation on AST2400 where it's known to be broken and some chip init updates.
This also adds the ability to turn HW checksum on/off and configure the ring sizes via ethtool. The next (and last) batch will add a few more "features" such as netpoll, multicast/promist, vlan offload...
