Add support for `CPH1853`

[r1sh73]

Is your device already requested?

• [X] I have searched the existing issues

Brand

Oppo

Name

Oppo A3s

Device code

CPH1853

Model

CPH1853

Device images

- Stock ROM: https://support.oppo.com/my/software-update/software-download/?m=A3s(CPH1853)
- Custom ROM: https://github.com/naz664/crDroid_gsi
- Recovery: Can't find in official twrp website

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

Current Android version is 8.1.0

[NWJ9PB]

Bump!