ARM: dts: socfpga: add missing reset-names for dma

The dma dts node was missing the reset-names = "dma". The reset driver
needs this line to get the reset property.
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm/boot/dts/socfpga.dtsi

@@ -85,6 +85,7 @@ pdma: pdma@ffe01000 {
 				clocks = <&l4_main_clk>;
 				clock-names = "apb_pclk";
 				resets = <&rst DMA_RESET>;
+				reset-names = "dma";
 			};
 		};