Remove external/valgrind from the manifest.

valgrind is no longer supported.

Bug: http://b/77856586
Test: N/A
Change-Id: I32bdfcdeb5a0860db883056958c5778527b7585c
1 file changed
tree: 91f247e7c46bd2ff2334b00fc9f42d3fc5a6b043
  1. GLOBAL-PREUPLOAD.cfg
  2. default.xml