Use std::cout consistently.

Consistently use:
std::cout to print to stdout.
std::cerr to print to stderr.

Test: SANITIZE_TARGET="address coverage" make vts -j64 && vts-tradefed
run commandAndExit vts --skip-all-system-status-check --primary-abi-only
--skip-preconditions -l VERBOSE --module VtsHalLightV2_0IfaceFuzzer
Change-Id: I4dbf09273bf5effe22bef9a9bd3467292e72d1c8
1 file changed