TPM: Add TPM driver files to romstage

This driver is required for reading and updating TPM space for recovery
MRC data hash in romstage.

BUG=chrome-os-partner:59355
BRANCH=None
TEST=Compiles successfully for reef.

Change-Id: I8edb7af13285a7a192e3d55fc6a11cfe12654bf9
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17270
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/vboot/Makefile.inc

@@ -67,8 +67,10 @@ verstage-y += common.c
 verstage-y += verstage.c
 ifeq (${CONFIG_VBOOT_MOCK_SECDATA},y)
 libverstage-y += secdata_mock.c
+romstage-$(CONFIG_SEPARATE_VERSTAGE) += secdata_mock.c
 else
 libverstage-y += secdata_tpm.c
+romstage-$(CONFIG_SEPARATE_VERSTAGE) += secdata_tpm.c
 endif
 romstage-y += vboot_handoff.c common.c