Throttle reboot from native watchdog

Found out that increasing the threshold to 20 crashes pushes the file
system based rollbacks as well. So introducing a throttling behaviour
instead. Now native watchdog performs reboot with ramdump at 5 restarts.
After that packageWatchdog/ RescueParty takes over to perform other
mitigations. Ram dump + reboot will not be performed more than once
in 24hrs.

Test: manual
Bug: 291137901
Change-Id: Ia192411dad94e8e25c26f700d2fe7f94d41439b8