arm64: zynqmp: Disable USB3.0 for zc1751-xm016-dc2

The board zynqmp-zc1751-xm016-dc2 support only USB2.0 that's why remove
USB3.0 DT configuration.

Signed-off-by: Piyush Mehta <piyush.mehta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/ad019501a851c5730427af948b636316f10b2e3b.1683034376.git.michal.simek@amd.com