_ebpf_epoch_release_free_list should re-arm the flush timer if needed

[Alan-Jowett]

_ebpf_epoch_release_free_list should re-arm the flush timer if needed.

ebpf_epoch_exit currently rearms the flush timer if the per-CPU free list is not empty, but _ebpf_epoch_update_cpu_entry does not. If the logic to rearm the timer is moved to _ebpf_epoch_release_free_list, it will be hit from both paths.

[Alan-Jowett]

Code no longer exists.