ARM: dts: imx6ul: add sram support for i.mx6ul

Add SRAM support for i.MX6UL, it has 128KB ocram
starting from 0x900000.
Signed-off-by: NAnson Huang <b20788@freescale.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6ul.dtsi

@@ -135,6 +135,11 @@
 			status = "disabled";
 		};
 
+		ocram: sram@00900000 {
+			compatible = "mmio-sram";
+			reg = <0x00900000 0x20000>;
+		};
+
 		aips1: aips-bus@02000000 {
 			compatible = "fsl,aips-bus", "simple-bus";
 			#address-cells = <1>;