dm: test: Add a test for of-platdata phandles

We have a test in dtoc for this feature, but not one in U-Boot itself.
Add a simple test that checks that the information comes through
correctly.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/clk/clk_fixed_rate.c

@@ -46,8 +46,8 @@ static const struct udevice_id clk_fixed_rate_match[] = {
 	{ /* sentinel */ }
 };
 
-U_BOOT_DRIVER(clk_fixed_rate) = {
-	.name = "fixed_rate_clock",
+U_BOOT_DRIVER(fixed_clock) = {
+	.name = "fixed_clock",
 	.id = UCLASS_CLK,
 	.of_match = clk_fixed_rate_match,
 	.ofdata_to_platdata = clk_fixed_rate_ofdata_to_platdata,

drivers/clk/clk_sandbox.c

@@ -124,8 +124,8 @@ static const struct udevice_id sandbox_clk_ids[] = {
 	{ }
 };
 
-U_BOOT_DRIVER(clk_sandbox) = {
-	.name		= "clk_sandbox",
+U_BOOT_DRIVER(sandbox_clk) = {
+	.name		= "sandbox_clk",
 	.id		= UCLASS_CLK,
 	.of_match	= sandbox_clk_ids,
 	.ops		= &sandbox_clk_ops,