In preparation to adding new features, switch cr50 to using shared
memory allocator allowing concurrently allocated buffers.
BRANCH=none
BUG=chrome-os-partner:59873
TEST=verified that cr50 works fine and could be updated on a reef.
Change-Id: I87656cbd1f6d4928f25396dbcc59cc3f43984d85
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/424850
Reviewed-by: Randall Spangler <rspangler@chromium.org>