Closed issue by dkwo on void-packages repository

https://github.com/void-linux/void-packages/issues/34117

Description:
I was trying to understand better how efi variables works.
I realised our kernel has both the old and new version, which leads to displaying two sets of efi variables:
```
$ ls /sys/firmware/efi/vars/
Display all 141 possibilities? (y or n)
$ ls /sys/firmware/efi/efivars/
Display all 139 possibilities? (y or n)
```
This is due to having both options:
```
CONFIG_EFI_VARS=y
CONFIG_EFIVAR_FS=y
```
According to Arch wiki, the first one should be avoided.
> UEFI Runtime Variables Support (old efivars sysfs interface - /sys/firmware/efi/vars). This option should be disabled to prevent any potential issues with both efivarfs and sysfs-efivars enabled.

Can anyone clarify what the correct thing to do is here, and whether we should set `CONFIG_EFI_VARS=n`?
Thanks.