vboot: update vb2_misc_tests to use VB2_WORKBUF_ALIGN
vboot: update vb2_misc_tests to use VB2_WORKBUF_ALIGN

If VB2_WORKBUF_ALIGN was set to any value other than 16, this
test would fail.  The test should not be dependent upon a
specific alignment, but rather account for this variable.

BUG=None
TEST=make clean && make runtests
BRANCH=none

Change-Id: Iaba095eba7a852bc2eb9711bf122a23c34cb66c3
Signed-off-by: Joel Kitching <c2feea8c1334a0d339e816ae4c7c9ecfa9b30a91@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1588028
Commit-Ready: Joel Kitching <c2feea8c1334a0d339e816ae4c7c9ecfa9b30a91@chromium.org>
Tested-by: Joel Kitching <c2feea8c1334a0d339e816ae4c7c9ecfa9b30a91@chromium.org>
Reviewed-by: Julius Werner <4d12f06cff3725783b352157673a720bc67c4afe@chromium.org>
Reviewed-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot