usb: doc: phy-mxs: update binding for adding anatop phandle
usb: doc: phy-mxs: update binding for adding anatop phandle

Add anatop phandle which is used to access anatop registers to
control PHY's power and other USB operations.

Signed-off-by: Peter Chen <c01a8c815a4ad165fff2d1c0d35ddf5b16bd3d7b@freescale.com>
Signed-off-by: Felipe Balbi <94dddeeef08b001e003cce128ddc162a4e2c6cd2@ti.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs