Add support for `j1xlteatt` (Samsung Galaxy Express 3)

[slavprussiaottomanfinlandUSUK]

Is your device already requested?

• I have searched the existing issues

Brand

Samsung

Name

Galaxy Express 3

Device code

j1xlteatt

Model

SAMSUNG-SM-J120A

Device images

Firmware: https://samfw.com/firmware/SM-J120A

Recovery: https://twrp.me/samsung/j1x3g.html

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

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

Additional context

Not sure if the TWRP recovery would work on this or if any exist at all on the Express 3. OEM unlocking is available on my device.

Device variants:
Galaxy J1 (2016)
Galaxy Amp 2

Not sure what the others use, but my Express 3 is an Exynos variant.