arm64: dts: hi3660: Fixup unofficial dma-min-chan to dma-channel-mask

A undocumented and unimplemented binding got into the hi3660
dtsi, and this switches that binding to the now documented one.

Cc: Tanglei Han <hantanglei@huawei.com>
Cc: Zhuangluan Su <suzhuangluan@hisilicon.com>
Cc: Ryan Grachek <ryan@edited.us>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Wei Xu <xuwei5@hisilicon.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: devicetree@vger.kernel.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi3660.dtsi

@@ -560,7 +560,7 @@ dma0: dma@fdf30000 {
 			#dma-cells = <1>;
 			dma-channels = <16>;
 			dma-requests = <32>;
-			dma-min-chan = <1>;
+			dma-channel-mask = <0xfffe>;
 			interrupts = <GIC_SPI 143 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&crg_ctrl HI3660_CLK_GATE_DMAC>;
 			dma-no-cci;