ARM: dts: stih410: align HDMI CEC node names with dtschema

The bindings expect "cec" for HDMI CEC node.

Reviewed-by: Patrice Chotard <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

arch/arm/boot/dts/stih410.dtsi

···
 			interrupts = <GIC_SPI 205 IRQ_TYPE_EDGE_RISING>;
 		};
 
-		sti-cec@94a087c {
+		cec@94a087c {
 			compatible = "st,stih-cec";
 			reg = <0x94a087c 0x64>;
 			clocks = <&clk_sysin>;