Update git submodules

* Update external/perfetto from branch 'master'
  to 978a967b8001f3d0269d11a29d2bc5527604b37a
  - Merge "perfetto-ui: Fix stale heap profile viewing option"
  - perfetto-ui: Fix stale heap profile viewing option
    
    Bug:149824430
    Change-Id: Ia6e09e36df78772e58bb2045fd217603703b1ac6
    
diff --git a/external/perfetto b/external/perfetto
index c92fd2e..978a967 160000
--- a/external/perfetto
+++ b/external/perfetto
@@ -1 +1 @@
-Subproject commit c92fd2efc899431e3876b86b4cd68e9dba61a187
+Subproject commit 978a967b8001f3d0269d11a29d2bc5527604b37a