CONFIG_EFI_SECRET is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

EFI secret area securityfs support

modulename: efi_secret.ko


Linux Kernel Configuration
└─>Device Drivers
└─>Virtualization drivers
└─>EFI secret area securityfs support
In linux kernel since version 5.2 (release Date: 2019-07-07)  
This is a driver for accessing the EFI secret area via securityfs.
The EFI secret area is a memory area designated by the firmware for
confidential computing secret injection (for example for AMD SEV
guests). The driver exposes the secrets as files in
<securityfs>/secrets/coco. Files can be read and deleted (deleting
a file wipes the secret from memory).

To compile this driver as a module, choose M here.
The module will be called efi_secret.

source code: