Add gpu_mem_total ftrace event

This change adds the proto updates required to trace gpu_mem_total
ftrace events from the android kernel.

Test: OUT=out/android_release_arm64 CONFIG=<trace proto config>
tools/tmux
Bug: 157142826

Change-Id: I3c18ded9239dca76592b9439cd8ecf0e42dcb0c2
diff --git a/BUILD b/BUILD
index 31ec7c2..4521953 100644
--- a/BUILD
+++ b/BUILD
@@ -2191,6 +2191,7 @@
         "protos/perfetto/trace/ftrace/ftrace_event_bundle.proto",
         "protos/perfetto/trace/ftrace/ftrace_stats.proto",
         "protos/perfetto/trace/ftrace/generic.proto",
+        "protos/perfetto/trace/ftrace/gpu_mem.proto",
         "protos/perfetto/trace/ftrace/i2c.proto",
         "protos/perfetto/trace/ftrace/ion.proto",
         "protos/perfetto/trace/ftrace/ipi.proto",