arm64: dts: imx8mm: Drop dma-apb interrupt-names

Drop "interrupt-names" property, since it is broken. The drivers/dma/mxs-dma.c
in Linux kernel does not use it, the property contains duplicate array entries
in existing DTs, and even malformed entries (gmpi, should have been gpmi). Get
rid of that optional property altogether.
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm.dtsi

@@ -1259,7 +1259,6 @@ dma_apbh: dma-controller@33000000 {
 				     <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
-			interrupt-names = "gpmi0", "gpmi1", "gpmi2", "gpmi3";
 			#dma-cells = <1>;
 			dma-channels = <4>;
 			clocks = <&clk IMX8MM_CLK_NAND_USDHC_BUS_RAWNAND_CLK>;