devices: fix flavors in packages with linux-lts

Tested only with tablet-x86uefi

/boot contents of tablet-x86uefi build:

.
├── config-lts
├── EFI
│   └── Boot
│       └── bootia32.efi
├── grub
│   └── grub.cfg
├── initramfs
├── initramfs-extra
├── System.map-lts
├── vmlinuz
└── vmlinuz-lts