vboot: Fix FWMP link error if TPM is mocked

The MOCK_TPM build flag caused link to fail because RollbackFwmpRead()
was missing its mock.

BUG=chromium:601492
BRANCH=baytrail and newer platforms
TEST=make -j runtests
     Hack makefile to add MOCK_TPM := 1 and make -j; no link errors.

Change-Id: I3885d6b6c627bf475f4da33ef67f31aec2159799
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/343920
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
2 files changed