export dumpstatez into stable_properties

Vendor might want to pause/resume some operations while a bugreport is captured
so that we need to export dumpstatez into stable_properties.h for vendor to get
property event when dumpstatez launch.

Test: confirmed manually with "adb bugreport"
Bug: 117536084
Change-Id: Ib743c5e59ca20cc44470110c814d85e4cbb90c0c
Signed-off-by: Minchan Kim <minchan@google.com>