Use a system property to call different bugreport types.

Currently, we define 4 hardcoded init services to launch dumpstate with
different command-line options (since dumpstate must be launched by
root):

- bugreport
- bugreportplus
- bugreportwear
- bugreportremote

This approach does not scale well; a better option is to have just one
service, and let the framework pass the extra arguments through a system
property.

BUG: 31649719

Test: manual
Change-Id: I1d627a73bfbdd9930c605fa4468c15282a23bb65