ARM: dts: keystone: k2g: Rename the TI-SCI clocks node name

We currently use clocks as the node name for the node representing
TI-SCI clock nodes. This is better renamed to being clock-controller
as that is a better representative of the system controller function
as a clock controller for the SoC.
Reviewed-by: Tero Kristo <kristo@kernel.org>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>

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

@@ -272,7 +272,7 @@ k2g_pds: power-controller {
 				#power-domain-cells = <1>;
 			};
 
-			k2g_clks: clocks {
+			k2g_clks: clock-controller {
 				compatible = "ti,k2g-sci-clk";
 				#clock-cells = <2>;
 			};