spi: remove sirf prima/atlas driver

* CSR SiRFprimaII Serial Peripheral Interface

Required properties:

- compatible : Should be "sirf,prima2-spi", "sirf,prima2-usp"

               or "sirf,atlas7-usp"

- reg : Offset and length of the register set for the device

- interrupts : Should contain SPI interrupt

- resets: phandle to the reset controller asserting this device in

          reset

  See ../reset/reset.txt for details.

- dmas : Must contain an entry for each entry in clock-names.

  See ../dma/dma.txt for details.

- dma-names : Must include the following entries:

  - rx

  - tx

- clocks : Must contain an entry for each entry in clock-names.

  See ../clocks/clock-bindings.txt for details.

- #address-cells: Number of cells required to define a chip select

                  address on the SPI bus. Should be set to 1.

- #size-cells:    Should be zero.

Optional properties:

- spi-max-frequency: Specifies maximum SPI clock frequency,

                     Units - Hz. Definition as per

                     Documentation/devicetree/bindings/spi/spi-bus.txt

- cs-gpios:     should specify GPIOs used for chipselects.

Example:

spi0: spi@b00d0000 {

	compatible = "sirf,prima2-spi";

	reg = <0xb00d0000 0x10000>;

	interrupts = <15>;

	dmas = <&dmac1 9>,

		<&dmac1 4>;

	dma-names = "rx", "tx";

	#address-cells = <1>;

	#size-cells = <0>;

	clocks = <&clks 19>;

	resets = <&rstc 26>;

};

	help

	  This exposes the SPI controller IP from SiFive.

config SPI_SIRF

	tristate "CSR SiRFprimaII SPI controller"

	depends on SIRF_DMA

	select SPI_BITBANG

	help

	  SPI driver for CSR SiRFprimaII SoCs

config SPI_SLAVE_MT27XX

	tristate "MediaTek SPI slave device"

	depends on ARCH_MEDIATEK || COMPILE_TEST

obj-$(CONFIG_SPI_SH_MSIOF)		+= spi-sh-msiof.o

obj-$(CONFIG_SPI_SH_SCI)		+= spi-sh-sci.o

obj-$(CONFIG_SPI_SIFIVE)		+= spi-sifive.o

obj-$(CONFIG_SPI_SIRF)		+= spi-sirf.o

obj-$(CONFIG_SPI_SLAVE_MT27XX)          += spi-slave-mt27xx.o

obj-$(CONFIG_SPI_SPRD)			+= spi-sprd.o

obj-$(CONFIG_SPI_SPRD_ADI)		+= spi-sprd-adi.o