dma: imx-dma: remove cpu_is_xxx by using platform_device_id

It changes the driver to use platform_device_id rather than cpu_is_xxx
to determine the controller type, and updates the platform code
accordingly.

As the result, mach/hardware.h inclusion gets removed from the driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Javier Martin <javier.martin@vista-silicon.com>
Cc: Vinod Koul <vinod.koul@linux.intel.com>

arch/arm/mach-imx/devices/devices-common.h

@@ -329,7 +329,7 @@ struct platform_device *__init imx_add_spi_imx(
 		const struct imx_spi_imx_data *data,
 		const struct spi_imx_master *pdata);
 
-struct platform_device *imx_add_imx_dma(resource_size_t iobase,
+struct platform_device *imx_add_imx_dma(char *name, resource_size_t iobase,
 					int irq, int irq_err);
 struct platform_device *imx_add_imx_sdma(char *name,
 	resource_size_t iobase, int irq, struct sdma_platform_data *pdata);

arch/arm/mach-imx/devices/platform-imx-dma.c

@@ -8,7 +8,7 @@
  */
 #include "devices-common.h"
 
-struct platform_device __init __maybe_unused *imx_add_imx_dma(
+struct platform_device __init __maybe_unused *imx_add_imx_dma(char *name,
 	resource_size_t iobase, int irq, int irq_err)
 {
 	struct resource res[] = {
@@ -28,7 +28,7 @@ struct platform_device __init __maybe_unused *imx_add_imx_dma(
 	};
 
 	return platform_device_register_resndata(&mxc_ahb_bus,
-			"imx-dma", -1, res, ARRAY_SIZE(res), NULL, 0);
+			name, -1, res, ARRAY_SIZE(res), NULL, 0);
 }
 
 struct platform_device __init __maybe_unused *imx_add_imx_sdma(char *name,