default or selected kernelversion does not have config value CONFIG_ANDROID_RAM_CONSOLE.
Result is shown for kernelversion 5.4.159

Android RAM buffer console

modulename: ram_console.ko

configname: CONFIG_ANDROID_RAM_CONSOLE

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Android
└─>Android RAM buffer console
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
source code:
drivers/staging/android/ram_console.c