ARM: dts: exynos: drop useless 'dma-channels/requests' properties

The pl330 DMA controller provides number of DMA channels and requests
through its registers, so duplicating this information (with a chance of
mistakes) in DTS is pointless. Additionally the DTS used always wrong
property names which causes DT schema check failures - the bindings
documented 'dma-channels' and 'dma-requests' properties without leading
hash sign.

Reported-by: Rob Herring <[e-mail]>
Suggested-by: Marek Szyprowski <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm/boot/dts/exynos3250.dtsi

···
 			clocks = <&cmu CLK_PDMA0>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		pdma1: dma-controller@12690000 {
···
 			clocks = <&cmu CLK_PDMA1>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		adc: adc@126c0000 {

arch/arm/boot/dts/exynos4.dtsi

···
 			clocks = <&clock CLK_PDMA0>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		pdma1: dma-controller@12690000 {
···
 			clocks = <&clock CLK_PDMA1>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		mdma1: dma-controller@12850000 {
···
 			clocks = <&clock CLK_MDMA>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <1>;
 		};
 
 		fimd: fimd@11c00000 {

arch/arm/boot/dts/exynos4210-universal_c210.dts

···
 		clocks = <&clock CLK_MDMA>;
 		clock-names = "apb_pclk";
 		#dma-cells = <1>;
-		#dma-channels = <8>;
-		#dma-requests = <1>;
 		power-domains = <&pd_lcd0>;
 	};
 };

arch/arm/boot/dts/exynos5250.dtsi

···
 			clocks = <&clock CLK_PDMA0>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		pdma1: dma-controller@121b0000 {
···
 			clocks = <&clock CLK_PDMA1>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		mdma0: dma-controller@10800000 {
···
 			clocks = <&clock CLK_MDMA0>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <1>;
 		};
 
 		mdma1: dma-controller@11c10000 {
···
 			clocks = <&clock CLK_MDMA1>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <1>;
 		};
 
 		gsc_0: gsc@13e00000 {

arch/arm/boot/dts/exynos5410.dtsi

···
 			clocks = <&clock CLK_PDMA0>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		pdma1: dma-controller@121b0000 {
···
 			clocks = <&clock CLK_PDMA1>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		audi2s0: i2s@3830000 {

arch/arm/boot/dts/exynos5420.dtsi

···
 			clocks = <&clock_audss EXYNOS_ADMA>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <6>;
-			#dma-requests = <16>;
 			power-domains = <&mau_pd>;
 		};
 
···
 			clocks = <&clock CLK_PDMA0>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		pdma1: dma-controller@121b0000 {
···
 			clocks = <&clock CLK_PDMA1>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <32>;
 		};
 
 		mdma0: dma-controller@10800000 {
···
 			clocks = <&clock CLK_MDMA0>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <1>;
 		};
 
 		mdma1: dma-controller@11c10000 {
···
 			clocks = <&clock CLK_MDMA1>;
 			clock-names = "apb_pclk";
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <1>;
 			/*
 			 * MDMA1 can support both secure and non-secure
 			 * AXI transactions. When this is enabled in