at91: vinco: Add FDT support

Sync DTS from Linux and add FDT support for AT91 vinco board.

usb0, usb1, and usb2 nodes removed, since there is no support it.

Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>