feat(zynqmp): add uart1 as console

Currently only UART0 is handled as console device, fix the
code to support UART1 as console also.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Change-Id: I08f69b65b78b967ceb7159f4a467aa5982b1f791