atrace: Add trace points for cpu frequency limits.

Change-Id: I6a20eaedb2943c3cde137ec091d898fc250ea763
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index d63019b..6e591fd 100644
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -103,6 +103,7 @@
     { "freq",       "CPU Frequency",    0, {
         { REQ,      "/sys/kernel/debug/tracing/events/power/cpu_frequency/enable" },
         { OPT,      "/sys/kernel/debug/tracing/events/power/clock_set_rate/enable" },
+        { OPT,      "/sys/kernel/debug/tracing/events/power/cpu_frequency_limits/enable" },
     } },
     { "membus",     "Memory Bus Utilization", 0, {
         { REQ,      "/sys/kernel/debug/tracing/events/memory_bus/enable" },