The USB controllers can be connected to one of the 2 SERDESes
using a MUX. Add a MUX controller node fot that.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Signed-off-by: NTero Kristo <t-kristo@ti.com>