dmaengine: idma64: Move driver name to the header

There are two drivers that are relying on the iDMA 64-bit driver name
to match. Instead of duplicating string in both of them, dedicate
a header file and share it between users.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/mfd/intel-lpss.c

@@ -28,6 +28,8 @@
 #include <linux/seq_file.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 
+#include <linux/dma/idma64.h>
+
 #include "intel-lpss.h"
 
 #define LPSS_DEV_OFFSET		0x000
@@ -96,8 +98,6 @@ static const struct resource intel_lpss_idma64_resources[] = {
 	DEFINE_RES_IRQ(0),
 };
 
-#define LPSS_IDMA64_DRIVER_NAME		"idma64"
-
 /*
  * Cells needs to be ordered so that the iDMA is created first. This is
  * because we need to be sure the DMA is available when the host controller