linux-postmarketos-qcom-sdm845: don't install linux.efi
linux-postmarketos-qcom-sdm845: don't install linux.efi
Space constraints in /boot result in mkinitfs failing. As we aren't using EFI booting yet, stop installing the ZBOOT kernel variant until this can be addressed properly (by moving the non-EFI vmlinuz binary out of /boot)