Update file kernels.txt.
Added linux-amd-znver2 (and headers) in the list. Added "Zen 2" and "Zen 3" in kernel descriptions to better distinguish the 2 packages from each other.
Added linux-amd-znver2 (and headers) in the list. Added "Zen 2" and "Zen 3" in kernel descriptions to better distinguish the 2 packages from each other.