drivers: net: cpsw: Add support for new CPSW IP version present in AM43xx SoC

The new IP version which is present in AM43xx SoC has a minor changes and the
offsets are same as the previous version, so adding new IP version support in
the driver.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>