CONFIG_HAVE_PLAT_DELAY is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_HAVE_PLAT_DELAY (not configurable)

configname: CONFIG_HAVE_PLAT_DELAY

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