depthcharge: remove GBB read functionality

GBB reading is now handled by vboot, and exposed via API
functions:
* vb2api_gbb_get_flags
* vb2api_gbb_read_hwid

cparams, cparams_init, and gbb_copy_in are no longer used,
and may be removed.

BUG=b:124141368, chromium:954774
TEST=Build locally
BRANCH=none

Change-Id: I04cbd67dbc1bb4fed07ed1615588fc30b2c94ee6
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/depthcharge/+/1663749
Tested-by: Joel Kitching <kitching@chromium.org>
Auto-Submit: Joel Kitching <kitching@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
2 files changed