phytool: Add recipe
A nice tool to directly read, write and interpret ethernet PHY data.
Very useful when debugging PHY or MDIO problems, which ethtool does
not do.
Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>