Staging: et131x: Clean up the phy code, especially dup stuff

Fold in the TPAL stuff and remove the duplication
Clean up other stuff where we do un-needed work or have verbose implementations
Comment some of the functions as we go

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>