dmaengine: Include dmaengine.h into dmaengine.c

Compiler is not happy about non-static functions due to missed inclusion

.../dmaengine.c:682:18: warning: no previous prototype for ‘dma_get_slave_channel’ [-Wmissing-prototypes]
  682 | struct dma_chan *dma_get_slave_channel(struct dma_chan *chan)
      |                  ^~~~~~~~~~~~~~~~~~~~~
.../dmaengine.c:713:18: warning: no previous prototype for ‘dma_get_any_slave_channel’ [-Wmissing-prototypes]
  713 | struct dma_chan *dma_get_any_slave_channel(struct dma_device *device)
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~

Include missed header to satisfy compiler.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200429122151.50989-1-andriy.shevchenko@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/dmaengine.c

@@ -53,6 +53,8 @@
 #include <linux/mempool.h>
 #include <linux/numa.h>
 
+#include "dmaengine.h"
+
 static DEFINE_MUTEX(dma_list_mutex);
 static DEFINE_IDA(dma_ida);
 static LIST_HEAD(dma_device_list);