vboot: use malloc and free directly

Originally, vboot1 code used VbExMalloc() and VbExFree() since it needed
to talk to EFI firmware that didn't have standard malloc() and free().
Now, coreboot and depthcharge implement them as wrappers around those
standard calls.  vboot2 code already calls them directly, so let vboot1
code do that too.

BUG=chromium:611535
BRANCH=none
TEST=make runtests; emerge-kevin coreboot depthcharge

Change-Id: I49ad0e32e38d278dc3589bfaf494bcf0e4b0a4bd
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/400905
41 files changed