usb: chipidea: add xilinx zynq platform data

Xilinx zynq udc do not need CI_HDRC_DISABLE_STREAMING flag to be set,
whereas default platform data has this flag set.So added zynq specific
platform data.Other platforms can add their specific platform data
in the same way.

Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>