arm64: dts: ti: k3-am65*: Use generic clock for syscon clock names

serdes and ehrpwm_tbclk nodes should be using clock@ naming for nodes
following standard conventions of device tree (section 2.2.2 Generic
Names recommendation in [1]).

[1] https://github.com/devicetree-org/devicetree-specification/tree/v0.3

Suggested-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Acked-by: Suman Anna <s-anna@ti.com>
Acked-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20200903130015.21361-5-nm@ti.com

arch/arm64/boot/dts/ti/k3-am65-main.dtsi

@@ -327,12 +327,12 @@
 			reg = <0x00000210 0x4>;
 		};
 
-		serdes0_clk: serdes_clk@4080 {
+		serdes0_clk: clock@4080 {
 			compatible = "syscon";
 			reg = <0x00004080 0x4>;
 		};
 
-		serdes1_clk: serdes_clk@4090 {
+		serdes1_clk: clock@4090 {
 			compatible = "syscon";
 			reg = <0x00004090 0x4>;
 		};
@@ -349,7 +349,7 @@
 			reg = <0x0000041e0 0x14>;
 		};
 
-		ehrpwm_tbclk: syscon@4140 {
+		ehrpwm_tbclk: clock@4140 {
 			compatible = "ti,am654-ehrpwm-tbclk", "syscon";
 			reg = <0x4140 0x18>;
 			#clock-cells = <1>;