[test-runner] Factor out logging/output

Previously, we explicitly used a semihosting initialized stdout to do
output.
This patch factors that out, making it usable in files other than
test-runner.c without extra code.

Bug: 124277696
Change-Id: I47d90df105f0664c83f832bed8950f4283fcf7df
6 files changed
tree: 3b9b70055d4149437233c3b0cf4b102d29c32b78
  1. .clang-format
  2. PREUPLOAD.cfg
  3. interface/
  4. ql-tipc/
  5. test-runner/