CONFIG_ARCH_ZYNQ is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Xilinx Zynq ARM Cortex A9 Platform
configname: CONFIG_ARCH_ZYNQ
Linux Kernel Configuration
└─>Xilinx Zynq ARM Cortex A9 Platform
In linux kernel since version 3.1 (release Date: 2011-10-24)
Support for Xilinx Zynq ARM Cortex A9 Platform