[media] dma-mapping: fix dma_common_get_sgtable() conditional compilation

dma_common_get_sgtable() function doesn't depend on
ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY, so it must not be compiled
conditionally.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/base/dma-mapping.c

@@ -218,6 +218,8 @@ void dmam_release_declared_memory(struct device *dev)
 }
 EXPORT_SYMBOL(dmam_release_declared_memory);
 
+#endif
+
 /*
  * Create scatter-list for the already allocated DMA buffer.
  */
@@ -236,8 +238,6 @@ int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 }
 EXPORT_SYMBOL(dma_common_get_sgtable);
 
-#endif
-
 /*
  * Create userspace mapping for the DMA-coherent memory.
  */