Allow LMKD to register for kswapd state changes

Enabling support for LMKD to use kswapd wake/sleep bpf programs.

Test: atest memevents_test
Bug: 330606003
Change-Id: I90ac0aaae78223baf76d5062d434630dc0da86ba
Signed-off-by: Carlos Galo <carlosgalo@google.com>
2 files changed