security/tpm: Improve TCPA log generation

* Make tcpa_log_init static and move init code into
the tcpa_log_add_table_entry routine.
* Add more checks for log initialization.
* Fix minor issues

Change-Id: I215d79eed7ad17c6ab87f0c4b14a282e519ef07d
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Reviewed-on: https://review.coreboot.org/27769
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/security/vboot/secdata_tpm.c

@@ -451,9 +451,6 @@ uint32_t vboot_setup_tpm(struct vb2_context *ctx)
 	if (result == TPM_E_MUST_REBOOT)
 		ctx->flags |= VB2_CONTEXT_SECDATA_WANTS_REBOOT;
 
-	// TCPA cbmem log
-	tcpa_log_init();
-
 	return result;
 }