[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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I update the latest code to r4768-89f8a01, this bug exist also.

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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#comment3383