vboot2: Fix flows for TPM_E_MUST_REBOOT

While migrating from vboot1 to vboot2, the tpm_init was moved out of
vboot library and implemented in coreboot. However, while doing this,
the initial factory flow was missed.

We need to ensure following flow for tpm_init:
1. Perform tpm_init
2. If tpm_init fails, set secdata_context flag to indicate to vboot
   that tpm needs reboot.
3. Call vb2_api_phase1
4. If vb2_api_phase1 returns error code saying boot into recovery,
   continue booting into recovery. For all other error codes, save
   context if required and reboot.

[pg: everything but step 2 was already done, so this upstream commit is
quite minimal]

TEST=Verified behavior on smaug. Steps to test:
1. Reboot into recovery
2. tpmc clear
3. Reboot device

Expected Behavior: Device should reboot after Enabling TPM. Should not
enter recovery

Confirmed that the device behaves as expected.

Change-Id: I72f08d583b744bd77accadd06958c61ade298dfb
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 85ac93137f3cfb28668dcfa18dfc773bf910d44e
Original-Change-Id: I38ab9b9d6c2a718ccc8641377508ffc93fef2ba1
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/300570
Original-Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Randall Spangler <rspangler@chromium.org>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/12205
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
diff --git a/src/vendorcode/google/chromeos/vboot2/antirollback.c b/src/vendorcode/google/chromeos/vboot2/antirollback.c
index 407b19c..654fd34 100644
--- a/src/vendorcode/google/chromeos/vboot2/antirollback.c
+++ b/src/vendorcode/google/chromeos/vboot2/antirollback.c
@@ -257,6 +257,7 @@
 		 * reset.  We do a hard reset to get around this.
 		VBDEBUG("TPM: soft reset detected\n", result);
 		return TPM_E_MUST_REBOOT;
 	} else if (result != TPM_SUCCESS) {
 		VBDEBUG("TPM: tlcl_startup returned %08x\n", result);
@@ -304,6 +305,7 @@
 		VBDEBUG("TPM: Must reboot to re-enable\n");
 		return TPM_E_MUST_REBOOT;