At the moment we check that the kernel variants for a device package
match the suffix of an existing linux-postmarketos-<suffix> package.
However, in most cases the name of the kernel subpackage has nothing
to do with the actual kernel that is used:
- the kernel subpackages usually have generic names like "mainline" or
"downstream", which have nothing to do with the actual suffixes like
"qcom-msm8916", "allwinner" or "novathor"
- pine64-dontbeevil uses kernel subpackages to switch between
"longts" and "shortts" device tree variants. Both are actually
using linux-postmarketos-allwinner.
So far we have been whitelisting names like "longts" or "shortts",
but the check does not seem very useful overall.
Removing it fixes the following CI failure for MSM8916:
RuntimeError: Invalid kernel subpackage name 'mainline-modem',
valid: ['downstream', 'rpi', 'rpi2', 'longts', 'shortts', 'stable', 'mainline',
'allwinner', 'qcom-msm8916', 'qcom-msm8974', 'novathor']
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