ARM: dts: am33xx: Add pm-sram phandle to soc node

Add a phandle to point to both the pm-sram-code and pm-sram-data nodes
so that the pm code can locate the sram regions needed to copy low level
PM code.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am33xx.dtsi

@@ -147,6 +147,8 @@
 		mpu {
 			compatible = "ti,omap3-mpu";
 			ti,hwmods = "mpu";
+			pm-sram = <&pm_sram_code
+				   &pm_sram_data>;
 		};
 	};