Use Clang instead of GCC for ATF build

Other GCC tools are still being used for ATF, but the compiler itself is
not.

Bug: 124390919
Change-Id: I8d7a9694a608ddb1bb7832dbe887fd2434352c49
1 file changed
tree: 638ffeff84a565677861a18fba6cf92739b11fdc
  1. .clang-format
  2. LICENSE
  3. PREUPLOAD.cfg
  4. project/