dmaengine: remove zte zx driver

* ZTE ZX296702 DMA controller

Required properties:

- compatible: Should be "zte,zx296702-dma"

- reg: Should contain DMA registers location and length.

- interrupts: Should contain one interrupt shared by all channel

- #dma-cells: see dma.txt, should be 1, para number

- dma-channels: physical channels supported

- dma-requests: virtual channels supported, each virtual channel

		have specific request line

- clocks: clock required

Example:

Controller:

	dma: dma-controller@09c00000{

		compatible = "zte,zx296702-dma";

		reg = <0x09c00000 0x1000>;

		clocks = <&topclk ZX296702_DMA_ACLK>;

		interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;

		#dma-cells = <1>;

		dma-channels = <24>;

		dma-requests = <24>;

	};

Client:

Use specific request line passing from dmax

For example, spdif0 tx channel request line is 4

	spdif0: spdif0@b004000 {

		#sound-dai-cells = <0>;

		compatible = "zte,zx296702-spdif";

		reg = <0x0b004000 0x1000>;

		clocks = <&lsp0clk ZX296702_SPDIF0_DIV>;

		clock-names = "tx";

		interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;

		dmas = <&dma 4>;

		dma-names = "tx";

	}

	  driver provides the dmaengine required by the DisplayPort subsystem

	  display driver.

config ZX_DMA

	tristate "ZTE ZX DMA support"

	depends on ARCH_ZX || COMPILE_TEST

	select DMA_ENGINE

	select DMA_VIRTUAL_CHANNELS

	help

	  Support the DMA engine for ZTE ZX family platform devices.

# driver files

source "drivers/dma/bestcomm/Kconfig"

obj-$(CONFIG_UNIPHIER_MDMAC) += uniphier-mdmac.o

obj-$(CONFIG_UNIPHIER_XDMAC) += uniphier-xdmac.o

obj-$(CONFIG_XGENE_DMA) += xgene-dma.o

obj-$(CONFIG_ZX_DMA) += zx_dma.o

obj-$(CONFIG_ST_FDMA) += st_fdma.o

obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/

obj-$(CONFIG_INTEL_LDMA) += lgm/