[FS#103] mt7620a leaks traffic during bootloader step

[LEDE Bugs]

The following task has a new comment added:

FS#103 - mt7620a leaks traffic during bootloader step
User who did this - Morteza Milani (milani)

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I ran into the same issue using GLI-MT300A, DHCP clients on LAN/WiFi got IP from router on WAN port. 
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=103#comment695