Pass dumpsys priority to IServiceManager

Modify IServiceManager to accept supported dumpsys priority as a bitmask
with NORMAL being the default priority. Change listServices to return
a list of services filtered by the priority or all services when the
priority is set to ALL.

BUG:27429130

Test: manual verification

Change-Id: If367ace2f37f918043f1b330568d8560676d9b78