Add suspend_resume_minimal synthetic ftrace event

Also had to move the synthetic event definition to its own file. This is
because init write does not open the file for append, and therefore only
the first write to trace/synthetic_events works.

Bug: 277016923
Test: manual
Change-Id: I7178985f63cb48505ab3e876d8886f3a30ee533c
diff --git a/cmds/atrace/ftrace_synthetic_events.conf b/cmds/atrace/ftrace_synthetic_events.conf
new file mode 100644
index 0000000..e2257fe
--- /dev/null
+++ b/cmds/atrace/ftrace_synthetic_events.conf
@@ -0,0 +1,2 @@
+rss_stat_throttled unsigned int mm_id; unsigned int curr; int member; long size
+suspend_resume_minimal bool start