Add hardware description for the USB-C port in the Radxa Rock 5 Model B.
This describes the OHCI, EHCI and XHCI USB parts, but not yet the
DisplayPort AltMode (bindings are not yet upstream).

For now the fusb302 node is marked with status "fail", since the board
is usually powered through the USB-C port. Handling of errors can result
in hard resets, which removed the bus power for some time resulting in
a board reset.

The main problem right now is that devices are supposed to interact with
the power-supply within 5 seconds after the plug event according to the
USB PD specification. This is more or less impossible to achieve when
the kernel is the first software communicating with the power-supply.

Currently the most likely workaround will be USB-PD handling added to
U-Boot. In that case U-Boot can update the status to "okay". That way
booting a kernel with the updated DT on an old U-Boot avoids a reset
loop.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>