CONFIG_PLATFORM_HAVE_XIP is not available for thedefaultarchitecture x86.
Result is shown for architecture xtensa

CONFIG_PLATFORM_HAVE_XIP (not configurable)

configname: CONFIG_PLATFORM_HAVE_XIP

Linux Kernel Configuration
└─>PLATFORM_HAVE_XIP
In linux kernel since version 5.1 (release Date: 2019-05-05)