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: I1ba9fc7bddd93aa0dc9a0ded8600c08e6ace886b
Merged-In: I1ba9fc7bddd93aa0dc9a0ded8600c08e6ace886b
(cherry picked from commit ed69045043dbf79cbbe244372c0ab159f7318734)
1 file changed