[FS#1502] MT7621 - MTU > 1500 not supported (was previously)

[LEDE Bugs]

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FS#1502 - MT7621  - MTU > 1500 not supported (was previously) 
User who did this: Mathias Kresin (mkresin)
Status: Unconfirmed -> Waiting on reporter

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1502