kernel: backport a patch that allows drivers to tweak the TSQ logic

Currently local TCP performance on wifi devices can be limited because
the TSQ (TCP Small Queues) code is tuned for wired ethernet latencies.

With this patch drivers can increase the amount of local buffering to
allow TCP to trigger larger aggregation sizes

This commit is modified from the upstream version to allow #ifdef based
backport feature detection

Signed-off-by: Felix Fietkau <nbd@nbd.name>