Add systrace tag for system property

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 98d0d4ba03c901be7262ad00d86fbc2f60ab1409)
1 file changed