test: add a test for the new tpm_auto_start() function

A prior patch adds a new API function for TPM2.0, which performs
the full startup sequence of the TPM.  Add a selftest for that.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

test/dm/tpm.c

@@ -25,6 +25,11 @@ static int dm_test_tpm(struct unit_test_state *uts)
 	ut_asserteq_str("init_done=0", buf);
 
 	ut_assertok(tpm_init(dev));
+	 /*
+	  * tpm auto start will rerun tpm_init, but handles the
+	  * -EBUSY return code internally.
+	  */
+	ut_assertok(tpm_auto_start(dev));
 
 	ut_assert(tpm_report_state(dev, buf, sizeof(buf)));
 	ut_asserteq_str("init_done=1", buf);