Add external/perfetto to the manifest

Bug: 65586521

default.xml

@@ -277,6 +277,7 @@
   <project path="external/parameter-framework" name="platform/external/parameter-framework" groups="pdk-fs,pdk-cw-fs" />
   <project path="external/pcre" name="platform/external/pcre" groups="pdk" />
   <project path="external/pdfium" name="platform/external/pdfium" groups="pdk" />
+  <project path="external/perfetto" name="platform/external/perfetto" groups="pdk" />
   <project path="external/piex" name="platform/external/piex" groups="pdk" />
   <project path="external/ppp" name="platform/external/ppp" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/proguard" name="platform/external/proguard" groups="pdk" />