This uses oem-specific packages for configuring Intel and AMD systems,
and installs them all by default for new images using pmbootstrap's
pmb_recommends feature.
The intention is to provide pre-built images with support for Intel and
AMD already enabled/configured, and users can remove an unwanted set of
packages (e.g., `apk del device-generic-x86_64-intel` when on an AMD
system) if they want to.
Upgrading existing systems should work, in that I haven't observed any
apk conflicts with it. But you do need to manually install the new
oem-specific package if you need it (e.g. `oem-intel`)
fixes https://gitlab.com/postmarketOS/pmaports/-/issues/2484
