arm: socfpga: vining: Fix UDC controller phandle in DT

The USB peripheral controller is the DWC2 controller 1, not 0.
Update the phandle to fix UDC support on this board.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Siew Chin Lim <elly.siew.chin.lim@intel.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>