libperfmgr: Add a new type of node to manage property

PowerHAL sometimes need set properties, adding a new type of node to
support this usage.

Change-Id: I0c04df831d10f16a37f6ae5ae234a9ef34fc5f54
Merged-In: I18a4a50993e262c59460dc5e6cbace22b2b50047
Fixes: 116731391
Bug: 110166984
Test: Add new unit tests and libperfmgr_test passing
15 files changed