firmware: replace VBDEBUG(()) macro with VB2_DEBUG()

The original VBDEBUG macro used doubly-nested parens to work with
MSVC, which didn't support varargs in macros.  We now only use more
modern compilers, so replace it with the VB2_DEBUG macro and get rid
of the ugly and fragile double parens.

BUG=chromium:611535
BRANCH=none
TEST=make runtests; build_packages --board=reef chromeos-firmware

Change-Id: Ifc0cb0733b14daaa1fde095fab7da4215a538c77
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/425133
Reviewed-by: Shelley Chen <shchen@chromium.org>
22 files changed