CONFIG_DEFAULT_CMDLINE is not available for thedefaultarchitecture x86.
Result is shown for architecture h8300
default or selected kernelversion does not have config value CONFIG_DEFAULT_CMDLINE.
Result is shown for kernelversion 6.2.5
Use builtin commandline
configname: CONFIG_DEFAULT_CMDLINE
Linux Kernel Configuration
└─>Kernel hacking
└─>Use builtin commandline
In linux kernel since version 2.6.12
builtin kernel commandline enabled.