[FS#963] chips is qca9531, pc ping device ip fail or timeout with big size, exp: ping 192.168.1.1 -l 65500

[LEDE Bugs]

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FS#963 - chips is qca9531, pc ping device ip fail or timeout with big size, exp: ping 192.168.1.1 -l 65500
User who did this - jiangyaohui (jiangyaohui)

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my board is cf-e320n-v2, revision is r4433-680a5c5
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=963#comment3381