Invoke rss_hwm_reset binary

Flip sys.rss_hwm_reset.on property to invoke the binary to reset RSS HWM
counters for all processes.

Test: m -j
Test: ProcessMemoryHighWaterMark pull
Bug: 119598534
Change-Id: I53d8c571b27ddee611193aa36fdbd3d4c88abebd
diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index 410bd19..7a30c9a 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -2627,6 +2627,8 @@
  *
  * Pulled from StatsCompanionService for all managed processes (from ActivityManagerServie)
  * and for selected native processes.
+ *
+ * Pulling this atom resets high-water mark counters for all processes.
  */
 message ProcessMemoryHighWaterMark {
     // The uid if available. -1 means not available.