[roll] Roll fuchsia [fxtdump] Summarize observed FIDL methods

It'll be more useful (and convenient) to work with a summary of FIDL
method names observed during a trace rather than each one.

Original-Bug: 484334982
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1543110
Original-Revision: ffd55852cdb2fda594646bdd870a23c92ef599d5
GitOrigin-RevId: a354ef8cb44714e0512832acacb19adc885f233c
Change-Id: I915bd375765f865077269be1cda8d046c44f4618

stem

diff --git a/stem b/stem
index c12dcb7..f17ea94 100644
--- a/stem
+++ b/stem
@@ -8,6 +8,6 @@
             manifest="manifests/platform"
             root=""
             remote="https://fuchsia.googlesource.com/fuchsia"
-            revision="3507968579f4d286fbd08c64644e77330c885e24"/>
+            revision="ffd55852cdb2fda594646bdd870a23c92ef599d5"/>
   </imports>
 </manifest>