ATRACE: Add fastrpc_stat to the memory category

Enables the fastrpc_stat tracepoint when the atrace memory category is
selected.

Bug: 170189835
Test: Validated trace with memory category enabled
Change-Id: I002662549153cf3bbf96c0d5794fc9e2a970758e
diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index 79419d3..021fdb5 100644
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -245,6 +245,7 @@
         { OPT,      "events/kmem/ion_heap_shrink/enable" },
         { OPT,      "events/ion/ion_stat/enable" },
         { OPT,      "events/gpu_mem/gpu_mem_total/enable" },
+        { OPT,      "events/fastrpc/fastrpc_dma_stat/enable" },
     } },
     { "thermal",  "Thermal event", 0, {
         { REQ,      "events/thermal/thermal_temperature/enable" },