Draft: samsung-milletwifi: new device

Wiki page: https://wiki.postmarketos.org/wiki/Samsung_Galaxy_Tab_4_8.0_Wi-Fi_(samsung-milletwifi)

Device currently just bootloops. Not certain way right now, need to look into getting some sort of logging happening.

However, I'm also unclear if using heimdall is the right approach here or if I should use lk2nd instead, as other devices with this chipset use lk2nd as well, and I already added support for this device to it. Is there a suggested approach here?

Also, there is upstream work for matisse, which is what I was basing some of this work on since it's such a similar device, but I don't think that's ready to use instead of the LineageOS downstream.