of: move of_translate_dma_address to of_address.h

of_translate_dma_address is implemented in common code, so move the
declaration there too.

Signed-off-by: Rob Herring <[e-mail]>
Acked-by: Grant Likely <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: [e-mail]

arch/powerpc/include/asm/prom.h

···
  * OF address retreival & translation
  */
 
-/* Translate a DMA address from device space to CPU space */
-extern u64 of_translate_dma_address(struct device_node *dev,
-				    const __be32 *in_addr);
-
 /* Parse the ibm,dma-window property of an OF node into the busno, phys and
  * size parameters.
  */

include/linux/of_address.h

···
 	res->name = np->full_name;
 }
 
+/* Translate a DMA address from device space to CPU space */
+extern u64 of_translate_dma_address(struct device_node *dev,
+				    const __be32 *in_addr);
+
 #ifdef CONFIG_OF_ADDRESS
 extern u64 of_translate_address(struct device_node *np, const __be32 *addr);
 extern bool of_can_translate_address(struct device_node *dev);