mocked_tpm: Add back missing paren

This was deleted in the previous commit and breaks building
with MOCK_TPM=1

BUG=chrome-os-partner:32698
BRANCH=all
TEST=build with MOCK_TPM=1

Change-Id: Ie437f9fb4c60161a95ca1cf992035858f02e3f19
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/227220
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
1 file changed