Workaround for `kallsyms_on_each_symbol`

`kallsyms_on_each_symbol` is no longer exported for use by kernel modules (https://lwn.net/Articles/813350/) but Chipmunk relies on it to find all instances of centralized persistence functions. The current workaround is to modify the tested kernel to export it, but we should find a better way to install kprobes on these functions.