ARM: dts: am335x-bone*: usb0 is hardwired for peripheral

Fixes: http://bugs.elinux.org/issues/127



the bb.org community was seeing random reboots before this change.

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>