ARM: zynq: Use recommended dma-controller name instead of dmac

Use standard name for dma controller. Issue is reported by dtbs_check as
dmac@f8003000: $nodename:0: 'dmac@f8003000' does not match
'^dma-controller(@.*)?$'

Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Michal Simek <[e-mail]>
Link: https://lore.kernel.org/r/5637[e-mail]

arch/arm/boot/dts/zynq-7000.dtsi

···
 			};
 		};
 
-		dmac_s: dmac@f8003000 {
+		dmac_s: dma-controller@f8003000 {
 			compatible = "arm,pl330", "arm,primecell";
 			reg = <0xf8003000 0x1000>;
 			interrupt-parent = <&intc>;