Add support for `o1s`

[Keyaku]

Is your device already requested?

• [X] I have searched the existing issues

Brand

Samsung

Name

Galaxy S21 5G

Device code

o1s

Model

G991B

Device images

- BeyondROM: https://xdaforums.com/t/rom-beyondrom-v6-0-26-11-2023-fwk2-exynos-sm-g99xb.4254933/
- Recovery: https://xdaforums.com/t/recovery-unofficial-twrp-for-galaxy-s21-exynos.4241869/

Do you own the device and would be willing to test the installer?

• [X] I own the device and am willing to test the installer on it.

Additional context

No response