ARM: dts: rockchip: remove #dma-cells from dma client nodes for rv1108

When we combine spi-rockchip.yaml and
spi-controller.yaml and add 'additionalProperties: false'
it gives for example this error:

arch/arm/boot/dts/rv1108-evb.dt.yaml: spi@10270000:
'#dma-cells' does not match any of the regexes:
'^.*@[0-9a-f]+$', '^slave$'

'#dma-cells' are not used for dma clients, so remove them all.

make ARCH=arm dtbs_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/spi-rockchip.yaml
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20200309134020.14935-1-jbx6244@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rv1108.dtsi

@@ -120,7 +120,6 @@ uart2: serial@10210000 {
 		clocks = <&cru SCLK_UART2>, <&cru PCLK_UART2>;
 		clock-names = "baudclk", "apb_pclk";
 		dmas = <&pdma 6>, <&pdma 7>;
-		#dma-cells = <2>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&uart2m0_xfer>;
 		status = "disabled";
@@ -136,7 +135,6 @@ uart1: serial@10220000 {
 		clocks = <&cru SCLK_UART1>, <&cru PCLK_UART1>;
 		clock-names = "baudclk", "apb_pclk";
 		dmas = <&pdma 4>, <&pdma 5>;
-		#dma-cells = <2>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&uart1_xfer>;
 		status = "disabled";
@@ -152,7 +150,6 @@ uart0: serial@10230000 {
 		clocks = <&cru SCLK_UART0>, <&cru PCLK_UART0>;
 		clock-names = "baudclk", "apb_pclk";
 		dmas = <&pdma 2>, <&pdma 3>;
-		#dma-cells = <2>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&uart0_xfer &uart0_cts &uart0_rts>;
 		status = "disabled";
@@ -208,7 +205,6 @@ spi: spi@10270000 {
 		clock-names = "spiclk", "apb_pclk";
 		dmas = <&pdma 8>, <&pdma 9>;
 		dma-names = "tx", "rx";
-		#dma-cells = <2>;
 		#address-cells = <1>;
 		#size-cells = <0>;
 		status = "disabled";