ARM: dts: keystone-k2g: Add ti-sci power domain node

Add a ti-sci k2g_pds node to act as our generic power domain provider
in the system.
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>

arch/arm/boot/dts/keystone-k2g.dtsi

@@ -152,6 +152,11 @@ pmmc: pmmc@02921c00 {
 				<&msgmgr 0 0>;
 			reg-names = "debug_messages";
 			reg = <0x02921c00 0x400>;
+
+			k2g_pds: power-controller {
+				compatible = "ti,sci-pm-domain";
+				#power-domain-cells = <1>;
+			};
 		};
 	};
 };