test: dm: skip scmi tests against disabled protocols

This is a precautionary change to make scmi tests workable whether or not
a specific protocol be enabled. If a given protocol is not configured,
we skip the test by returning -EAGAIN.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/scmi.c b/test/dm/scmi.c
index da45314..5824854 100644
--- a/test/dm/scmi.c
+++ b/test/dm/scmi.c
@@ -217,6 +217,9 @@
 	u8 *name;
 	int ret;
 
+	if (!CONFIG_IS_ENABLED(SCMI_POWER_DOMAIN))
+		return -EAGAIN;
+
 	/* preparation */
 	ut_assertok(load_sandbox_scmi_test_devices(uts, &agent, &dev));
 	ut_assertnonnull(agent);
@@ -317,6 +320,9 @@
 	int ret_dev;
 	int ret;
 
+	if (!CONFIG_IS_ENABLED(CLK_SCMI))
+		return -EAGAIN;
+
 	ret = load_sandbox_scmi_test_devices(uts, &agent, &dev);
 	if (ret)
 		return ret;
@@ -382,6 +388,9 @@
 	struct udevice *agent_dev, *reset_dev, *dev = NULL;
 	int ret;
 
+	if (!CONFIG_IS_ENABLED(RESET_SCMI))
+		return -EAGAIN;
+
 	ret = load_sandbox_scmi_test_devices(uts, &agent, &dev);
 	if (ret)
 		return ret;
@@ -418,6 +427,9 @@
 	struct udevice *dev;
 	struct udevice *regul0_dev;
 
+	if (!CONFIG_IS_ENABLED(DM_REGULATOR_SCMI))
+		return -EAGAIN;
+
 	ut_assertok(load_sandbox_scmi_test_devices(uts, &agent, &dev));
 
 	scmi_devices = sandbox_scmi_devices_ctx(dev);