dmaengine: bump initcall level to arch_initcall

There are dmaengine users that would like to register dma devices at
subsys_initcall time to ensure channels are available by device_initcall
time.

Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/dca/dca-core.c

@@ -270,6 +270,6 @@ static void __exit dca_exit(void)
 	dca_sysfs_exit();
 }
 
-subsys_initcall(dca_init);
+arch_initcall(dca_init);
 module_exit(dca_exit);
 

drivers/dma/dmaengine.c

@@ -318,7 +318,7 @@ static int __init dma_channel_table_init(void)
 
 	return err;
 }
-subsys_initcall(dma_channel_table_init);
+arch_initcall(dma_channel_table_init);
 
 /**
  * dma_find_channel - find a channel to carry out the operation
@@ -990,6 +990,6 @@ static int __init dma_bus_init(void)
 	mutex_init(&dma_list_mutex);
 	return class_register(&dma_devclass);
 }
-subsys_initcall(dma_bus_init);
+arch_initcall(dma_bus_init);