[FS#350] Lantiq: ARV4518pw and ARV7518pw both are stuck in endless reboots

[LEDE Bugs]

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FS#350 - Lantiq: ARV4518pw and ARV7518pw both are stuck in endless reboots
User who did this - Mathias Kresin (mkresin)

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Hey Mohammed,

there are two issues with your devices. The first one is that the serial console doesn't work any longer due to a recent patch. That is what my patch tries to fix.

The second and real problem should be visible as soon as the serial console works again.

Would you please give the attached patch a try. The first one didn't worked the way as I expected.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=350#comment1083