arm: dts: am335x: enable scm_clocks auto binding

Adding the 'simple-bus' compatible string to the scm_clocks node will
allow its automatic binding.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
diff --git a/arch/arm/dts/am33xx-u-boot.dtsi b/arch/arm/dts/am33xx-u-boot.dtsi
index 2426ece..61d10b8 100644
--- a/arch/arm/dts/am33xx-u-boot.dtsi
+++ b/arch/arm/dts/am33xx-u-boot.dtsi
@@ -13,3 +13,7 @@
 &prcm_clocks {
 	compatible = "simple-bus";
 };
+
+&scm_clocks {
+	compatible = "simple-bus";
+};