vboot: fix mocked TPM build
vboot: fix mocked TPM build

These function prototypes changed recently and the mocked driver is not
building any longer.

BUG=none
BRANCH=none
TEST=successful build with MOCK_TPM=1

Change-Id: Iaaf2d2c2883add7a478d7ee887b06e45c65e1bb2
Signed-off-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/65338
Reviewed-by: Stefan Reinauer <0ab4fef0c228799b0c44e01c732054569b690b58@google.com>
Reviewed-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>

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