This syncs u-boot with the upstream branch, and includes the following
new features:
- support for board rev in u-boot
- fix uart4
[ci:skip-build]: already built successfully in CI
This upgrades u-boot to the latest upstream Purism version, and uses the
latest DDR training firmware.
APKBUILD was reformatted to replace indentation with tabs.
This renamed the u-boot package for Purism librem5 devices, since the
phone and devkit share the same u-boot version. It also updates the
various components to the latest versions