[FS#991] untagged vlan do not work on mt7620

[LEDE Bugs]

The following task has a new comment added:

FS#991 - untagged vlan do not work on mt7620
User who did this - Jo-Philipp Wich (jow-)

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Fixed with https://git.openwrt.org/341b1427fc (ramips: properly map pvid for vlans with remapped vid on mt7530/762x switches)
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=991#comment4322