zynqmp: Provide option to enable uart dcc support for zynqmp

Provide option to enable uart dcc support for zynqmp
This config can be enabled as per board config file.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>