ARM: dts: keystone: Add PSC node

The Power Sleep Controller (PSC) module is responsible
for the power and clock management for each of the peripherals
present on the SoC. Represent this as a syscon node so that
multiple users can leverage it for various functionalities.

Signed-off-by: Suman Anna <s-anna@ti.com>
[afd@ti.com: add simple-mfd compatible]
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>

arch/arm/boot/dts/keystone.dtsi

@@ -83,6 +83,11 @@
 			reg = <0x02310000 0x200>;
 		};
 
+		psc: power-sleep-controller@02350000 {
+			compatible = "syscon", "simple-mfd";
+			reg = <0x02350000 0x1000>;
+		};
+
 		devctrl: device-state-control@02620000 {
 			compatible = "ti,keystone-devctrl", "syscon";
 			reg = <0x02620000 0x1000>;