ARM: dts: Fix am335x and dm814x scm syscon to probe children

Without these changes children of the scn syscon
won't probe.

Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
index 64c8aa9..8e80d97 100644
--- a/arch/arm/boot/dts/am33xx.dtsi
+++ b/arch/arm/boot/dts/am33xx.dtsi
@@ -144,10 +144,11 @@
 				};
 
 				scm_conf: scm_conf@0 {
-					compatible = "syscon";
+					compatible = "syscon", "simple-bus";
 					reg = <0x0 0x800>;
 					#address-cells = <1>;
 					#size-cells = <1>;
+					ranges = <0 0 0x800>;
 
 					scm_clocks: clocks {
 						#address-cells = <1>;