dmaengine: cirrus: Convert to DT for Cirrus EP93xx

Convert Cirrus EP93xx DMA to device tree usage:

- add OF ID match table with data
- add of_probe for device tree
- add xlate for m2m/m2p
- drop subsys_initcall code
- drop platform probe
- drop platform structs usage

>From now on it only supports device tree probing.

Co-developed-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Tested-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

include/linux/platform_data/dma-ep93xx.h

@@ -3,8 +3,11 @@
 #define __ASM_ARCH_DMA_H
 
 #include <linux/types.h>
+#include <linux/device.h>
 #include <linux/dmaengine.h>
 #include <linux/dma-mapping.h>
+#include <linux/property.h>
+#include <linux/string.h>
 
 /*
  * M2P channels.
@@ -70,6 +73,9 @@ struct ep93xx_dma_platform_data {
 
 static inline bool ep93xx_dma_chan_is_m2p(struct dma_chan *chan)
 {
+	if (device_is_compatible(chan->device->dev, "cirrus,ep9301-dma-m2p"))
+		return true;
+
 	return !strcmp(dev_name(chan->device->dev), "ep93xx-dma-m2p");
 }