[FS#1147] VLAN problem with MT7530 switch

[LEDE Bugs]

The following task has a new comment added:

FS#1147 - VLAN problem with MT7530 switch
User who did this - Jo-Philipp Wich (jow-)

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After reviewing the driver some more I came up with a possible explaination of the behaviour and some likely solution. Please test my commit at https://git.openwrt.org/?p=openwrt/staging/jow.git;a=commitdiff;h=0ecf301acb3bc78423056b868d22f8b755b74e31
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1147#comment4311