add vs6621 support in android

lin

2025-08-21 57113df3a0e2be01232281fad9a5f2c060567981

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:PREROUTING,FORWARD,OUTPUT,POSTROUTING
*mangle
-j ECN;;FAIL
-p tcp -j ECN;;FAIL
-p tcp -j ECN --ecn-tcp-remove;=;OK