[FS#986] ARV752DPW missing default switch config

[LEDE Bugs]

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FS#986 - ARV752DPW missing default switch config
User who did this - Oliver Muth (Oliver)

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First experiments:

"swconfig dev switch0 show && reboot" did not trigger any issue.

Setting pin 19 to output resets the switch (output default value is '0'). After setting it to '1' the switch comes back with all 16 vlans configured (CPU port is __**not**__ connected). Removing all vlans with swconfig and running "/etc/init.d/network restart" leads to the same switch configuration as a cold start: vlans 0 to 5 are configured, even though only 1 and 2 are configured in /etc/config/network.
See attached file.
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One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=986#comment3404