uboot-phytec

omap3_beagle: use new MUSB intstead of the old one

Enable using of new MUSB framework on Beagle.

NOTE! This is not just a change of backend code: top-level behavior
is also changed, we now use USB device port for USB Ethernet instead
of serial.

Signed-off-by: Ilya Yanok <ilya.yanok@cogentembedded.com>