arm64: dts: rockchip: align pl330 node name with dtschema

Fixes dtbs_check warnings like:

  dmac@ff240000: $nodename:0: 'dmac@ff240000' does not match '^dma-controller(@.*)?$'
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20220129175429.298836-1-krzysztof.kozlowski@canonical.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/px30.dtsi

@@ -711,7 +711,7 @@ rktimer: timer@ff210000 {
 		clock-names = "pclk", "timer";
 	};
 
-	dmac: dmac@ff240000 {
+	dmac: dma-controller@ff240000 {
 		compatible = "arm,pl330", "arm,primecell";
 		reg = <0x0 0xff240000 0x0 0x4000>;
 		interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>,

arch/arm64/boot/dts/rockchip/rk3328.dtsi

@@ -489,7 +489,7 @@ pwm3: pwm@ff1b0030 {
 		status = "disabled";
 	};
 
-	dmac: dmac@ff1f0000 {
+	dmac: dma-controller@ff1f0000 {
 		compatible = "arm,pl330", "arm,primecell";
 		reg = <0x0 0xff1f0000 0x0 0x4000>;
 		interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>,