[PATCH] ltq-atm/ltq-ptm: avoid unnecessary build dependencies

[Martin Blumenstingl]

On Mon, Apr 25, 2022 at 9:47 PM Jan Hoffmann <jan at 3e8.eu> wrote:
>
> Right now, both ltq-adsl-mei and ltq-vdsl-mei are always built, even
> when they aren't necessary for the selected variant. This can cause the
> build to fail, for example ltq-vdsl-mei doesn't build successfully here
> on xway target due to the vectoring callback.
>
> Make these dependencies conditional on the specific package variants,
> so they are only built when actually needed.
>
> Signed-off-by: Jan Hoffmann <jan at 3e8.eu>
Tested-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>

This fixes a build issue on my local system when building the xway
subtarget with Linux 5.15.
Thank you Jan for identifying and fixing this!