Remove external/fio from the manifest.

Bug: http://b/74195807
Test: builds
Change-Id: I682bfeac93f4f3a3f1fbf93e9324b86bd585396f

default.xml

@@ -143,7 +143,6 @@
   <project path="external/f2fs-tools" name="platform/external/f2fs-tools" groups="pdk" />
   <project path="external/fdlibm" name="platform/external/fdlibm" groups="pdk" />
   <project path="external/fec" name="platform/external/fec" groups="pdk" />
-  <project path="external/fio" name="platform/external/fio" groups="pdk" />
   <project path="external/flac" name="platform/external/flac" groups="pdk" />
   <project path="external/flatbuffers" name="platform/external/flatbuffers" groups="pdk" />
   <project path="external/fonttools" name="platform/external/fonttools" groups="pdk" />