Blackfin: dma: constify MMR pointer array

The array of pointers is never written, so constify it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h
index be862e7..d9dbc1a 100644
--- a/arch/blackfin/include/asm/dma.h
+++ b/arch/blackfin/include/asm/dma.h
@@ -116,7 +116,7 @@
 *	DMA API's
 *******************************************************************************/
 extern struct dma_channel dma_ch[MAX_DMA_CHANNELS];
-extern struct dma_register *dma_io_base_addr[MAX_DMA_CHANNELS];
+extern struct dma_register * const dma_io_base_addr[MAX_DMA_CHANNELS];
 extern int channel2irq(unsigned int channel);
 
 static inline void set_dma_start_addr(unsigned int channel, unsigned long addr)