pmb.flasher.frontend: detect lk2nd as subpackage dependency

When lk2nd is a dependency of a device subpackage (e.g. a mainline kernel subpackage), it is not detected.

Thus, if no lk2nd pacakge is found, also parse the dependencies of all subpackages.

mentioned in merge request pmaports!5919 (merged)

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added 13 commits

• 00e01f43...5ed5817e - 12 commits from branch postmarketOS:master
• 78407655 - pmb.flasher.frontend: detect lk2nd as subpackage dependency (MR 2511)

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