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 <[e-mail]>
Signed-off-by: Nishanth Menon <[e-mail]>
Signed-off-by: Santosh Shilimkar <[e-mail]>

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

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