Revert "tcp: free batches of packets in tcp_prune_ofo_queue()"

This reverts commit 553ffa5d.

This is a preparation change for merging android-4.14 commit
48a0bb1a into msm-4.14 branch.

The reverted change is committed already as:

751f22bb tcp: free batches of packets in tcp_prune_ofo_queue()

Change-Id: If0649a06be1904bb73418b5dbb65da11d93f7474
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>