Add support for `XP8800`

[uneaire]

Is your device already requested?

• I have searched the existing issues

Brand

sonim xp8800

Name

Sonim xp8800 / cbec0778 / PVT

Device code

XP8800

Model

No response

Device images

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