linux: Add LTS version 4.14.30

Announcements and change-logs are available online [1–9].

[1] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.23
[2] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.24
[3] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.25
[4] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.26
[5] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.27
[6] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.28
[7] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.29
[8] https://lkml.org/lkml/2018/3/25/24
[9] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.30