Move the persistent property set to IoThread

The persistent property set caused a ~5.61ms regression in
the system_server SuccessiveBootTest. Moving it to IoThread.

Bug: 148098870
Test: atest google/perf/boottime/boottime-test
Change-Id: I737a6c5390d292b313f4436c83ec27a546c3cf0b
1 file changed