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)
diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index 08f44c8..2519ffa 100644
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -124,6 +124,7 @@
     { "aidl",       "AIDL calls",               ATRACE_TAG_AIDL, { } },
     { "nnapi",      "NNAPI",                    ATRACE_TAG_NNAPI, { } },
     { "rro",        "Runtime Resource Overlay", ATRACE_TAG_RRO, { } },
+    { "sysprop",    "System Property",          ATRACE_TAG_SYSPROP, { } },
     { k_coreServiceCategory, "Core services", 0, { } },
     { k_pdxServiceCategory, "PDX services", 0, { } },
     { "sched",      "CPU Scheduling",   0, {