sandbox: dts: Add compatible string for bind-test node

Usage of lists_bind_fdt() in bind command imposes to add
a compatible string for bind-test node.

Others impacts are:
  - bind-test node is binded at sandbox start, so no need to bind it
    in test_bind_unbind_with_node() test.
  - As explained just above, after sandbox start, now a phy exist.
    In test/dm/phy.c, it was verified that a third phy didn't exist,
    now we must verified that a fourth phy doesn't exist.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/sandbox/dts/test.dts

@@ -149,6 +149,7 @@
 	};
 
 	bind-test {
+		compatible = "simple-bus";
 		bind-test-child1 {
 			compatible = "sandbox,phy";
 			#phy-cells = <1>;

test/dm/phy.c

@@ -47,7 +47,7 @@ static int dm_test_phy_base(struct unit_test_state *uts)
 	ut_assert(phy2.dev != phy3.dev);
 
 	/* Try to get a non-existing phy */
-	ut_asserteq(-ENODEV, uclass_get_device(UCLASS_PHY, 3, &dev));
+	ut_asserteq(-ENODEV, uclass_get_device(UCLASS_PHY, 4, &dev));
 	ut_asserteq(-ENODATA, generic_phy_get_by_name(parent,
 					"phy_not_existing", &phy1_method1));
 

test/py/tests/test_bind.py

@@ -25,9 +25,6 @@ def in_tree(response, name, uclass, drv, depth, last_child):
 @pytest.mark.buildconfigspec('cmd_bind')
 def test_bind_unbind_with_node(u_boot_console):
 
-	#bind /bind-test. Device should come up as well as its children
-	response = u_boot_console.run_command('bind  /bind-test simple_bus')
-	assert response == ''
 	tree = u_boot_console.run_command('dm tree')
 	assert in_tree(tree, 'bind-test', 'simple_bus', 'simple_bus', 0, True)
 	assert in_tree(tree, 'bind-test-child1', 'phy', 'phy_sandbox', 1, False)