Changes:
* device-samsung-klte with both downstream and mainline kernel
subpackages
* linux-postmarketos-qcom updated to last commit
What works in mainline kernel:
* internal SD card
* volume and home key buttons
* usb network
* linux-postmarketos-qcom: Remove composite USB gadget
* linux-postmarketos-qcom: Fix usb networking
- Enable functionfs so we're able to actually configure the USB
networking
- Enable the USB serial console for convenience, although not enabled by
default pre-composed configuration