Remove GCC/binutils prebuilts

We no longer need the GCC and binutils prebuilts for Trusty - all code
builds with clang and we use the LLVM version of the utilities. Removes
the pinned binutils repos from Trusty.

Bug: 204914889
Test: build.py
Change-Id: I0ce9f9b6b05fcf48e2804e9a6516794fc6b4cf82
1 file changed
tree: ae32c48864e31f41a041ce85d428e99c7bf31717
  1. default.xml
  2. GLOBAL-PREUPLOAD.cfg