lantiq: Make the ar9.dtsi sram node match "simple-bus"

All other SoC types are using "lantiq,sram" and "simple-bus" to ensure
that all child nodes are set up correctly during linux kernel
initialization (plat_of_setup(void) in arch/mips/lantiq/prom.c). Without
this some of sram child nodes might not be parsed.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

SVN-Revision: 48548

target/linux/lantiq/dts/ar9.dtsi

@@ -40,7 +40,7 @@
 	sram@1F000000 {
 		#address-cells = <1>;
 		#size-cells = <1>;
-		compatible = "lantiq,sram";
+		compatible = "lantiq,sram", "simple-bus";
 		reg = <0x1F000000 0x800000>;
 		ranges = <0x0 0x1F000000 0x7FFFFF>;