default or selected kernelversion does not have config value CONFIG_EROFS_FAULT_INJECTION.
Result is shown for kernelversion 6.9.9

EROFS fault injection facility

configname: CONFIG_EROFS_FAULT_INJECTION

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>EROFS fault injection facility
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Test EROFS to inject faults such as ENOMEM, EIO, and so on.
If unsure, say N.