2lib: add VB2_DEBUG_RAW() to print without function name

Currently, VB2_DEBUG() will print the function name as a prefix to the
debug output.  Add VB2_DEBUG_RAW() to print without that, so that it's
possible to print little bits of debug output.  Use this in ec_sync to
hex dump the hashes.

And then clean up all of the debug calls which explicitly did things like:
    VB2_DEBUG("%s: foo", __func__);
to just:
    VB2_DEBUG("foo");
so they don't double-print the function name

BUG=chromium:683391
BRANCH=none
TEST=build_packages --board=reef chromeos-firmware &&
     DEBUG=1 make -j runtests
CQ-DEPEND=CL:430978,CL:431111

Change-Id: I0c35519d2e670d55d65d01eaa60d61f3e3edf419
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/431171
Reviewed-by: Julius Werner <jwerner@chromium.org>
12 files changed