external cleanup (#19647)

* remove external

* put back ffmpeg for now

selfdrive/debug/profiling/simpleperf/eon_perf.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+set -e
+
+cd "$( dirname "${BASH_SOURCE[0]}" )"
+
+ssh "$1" '$HOME/one/external/simpleperf/bin/android/arm64/simpleperf record --call-graph fp -a --duration 10 -o /tmp/perf.data'
+scp "$1":/tmp/perf.data /tmp/perf.data
+python2 report_html.py -i /tmp/perf.data -o /tmp/report.html

selfdrive/debug/profiling/simpleperf/get.txt

@@ -0,0 +1,3 @@
+git clone https://android.googlesource.com/platform/prebuilts/simpleperf
+git reset --hard 311a9d2cd27841498fc90a0b26a755deb47e7ebd
+cp -r report_html.* simpleperf_report_lib.py utils.py inferno lib ~/one/external/simpleperf/