vboot: standardize on working data size

Previously, the size of memory made for vboot_working_data
through the macro VBOOT2_WORK was always specified in each
individual memlayout file.  However, there is effectively no
reason to provide this customizability -- the workbuf size
required for verifying firmware has never been more than 12K.
(This could potentially increase in the future if key sizes
or algorithms are changed, but this could be applied globally
rather than for each individual platform.)

This CL binds the VBOOT2_WORK macro to directly use the
VB2_WORKBUF_RECOMMENDED_DATA_SIZE constant as defined by vboot
API.  Since the constant needs to be used in a linker script, we
may not include the full vboot API, and must instead directly
include the vb2_constants.h header.

BUG=b:124141368, b:124192753
TEST=Build locally for eve
TEST=util/lint/checkpatch.pl -g origin/master..HEAD
TEST=util/abuild/abuild -B -e -y -c 50 -p none -x
TEST=make clean && make test-abuild
BRANCH=none
CQ-DEPEND=CL:1504490

Change-Id: Id71a8ab2401efcc0194d48c8af9017fc90513cb8
Signed-off-by: Joel Kitching <kitching@google.com>
---
M src/arch/x86/car.ld
M src/include/memlayout.h
M src/security/vboot/common.c
M src/soc/nvidia/tegra124/include/soc/memlayout.ld
M src/soc/qualcomm/ipq40xx/include/soc/memlayout.ld
M src/soc/qualcomm/ipq806x/include/soc/memlayout.ld
M src/soc/qualcomm/qcs405/include/soc/memlayout.ld
M src/soc/qualcomm/sdm845/include/soc/memlayout.ld
M src/soc/samsung/exynos5250/include/soc/memlayout.ld
9 files changed, 21 insertions(+), 30 deletions(-)