CONFIG_DEBUG_ZYNQ_UART0 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Kernel low-level debugging on Xilinx Zynq using UART0

configname: CONFIG_DEBUG_ZYNQ_UART0

Kernel low-level debugging port
└─>Kernel low-level debugging on Xilinx Zynq using UART0
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say Y here if you want the debug print routines to direct
their output to UART0 on the Zynq platform.