VbInit(): printout gbb flags as well
VbInit(): printout gbb flags as well

It's extremely helpful to know what a device's gbb flags are when
running vboot. It aids in debugging issues by providing more
information and context.

BUG=None
BRANCH=None
TEST=Built and booted. Checked log.

Change-Id: I663de6f617f0e8c74e2b2f3b7a2be63f4a9c020a
Signed-off-by: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/63489
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

coreboot/vboot,ccaapton/vboot_reference,coreboot/vboot,geekboxzone/mmallow_external_vboot_reference,geekboxzone/mmallow_external_vboot_reference,ccaapton/vboot_reference,ccaapton/vboot_reference,geekboxzone/mmallow_external_vboot_reference,geekboxzone/mmallow_external_vboot_reference,coreboot/vboot,ccaapton/vboot_reference,geekboxzone/mmallow_external_vboot_reference,acorn-marvell/vboot_reference,acorn-marvell/vboot_reference,coreboot/vboot,acorn-marvell/vboot_reference,acorn-marvell/vboot_reference,coreboot/vboot