Revert "bpf, sockmap: TCP data stall on recv before accept"

This reverts commit ab90b68f.

It breaks the Android KABI and will be brought back at a later time when
it is safe to do so.

Bug: 161946584
Change-Id: If61ba37db2a3ea1642c9e5c9295e2d7d4a94207b
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>