Introduce a new systrace tag, TRACE_TAG_SYSPROP, for use with
system property.
Bug: 147275573
Test: build
Change-Id: Id78992d238a73257bb9b80bfaa6bbfeb16f477d8
Merged-In: Id78992d238a73257bb9b80bfaa6bbfeb16f477d8
(cherry picked from commit 98d0d4ba03)