ARM: dts: keystone-k2g: Add ti-sci clock provider node

Add a ti-sci node representing the clock provider in the system.
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

@@ -157,6 +157,11 @@ k2g_pds: power-controller {
 				compatible = "ti,sci-pm-domain";
 				#power-domain-cells = <1>;
 			};
+
+			k2g_clks: clocks {
+				compatible = "ti,k2g-sci-clk";
+				#clock-cells = <2>;
+			};
 		};
 	};
 };