ARM: dts: zynq-7000: 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]>
Acked-by: Michal Simek <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

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

···
 			             <0 40 4>, <0 41 4>,
 			             <0 42 4>, <0 43 4>;
 			#dma-cells = <1>;
-			#dma-channels = <8>;
-			#dma-requests = <4>;
 			clocks = <&clkc 27>;
 			clock-names = "apb_pclk";
 		};