DMA: PL08x: constify plchan->cd and plat->slave_channels

We no longer write to the channel data structure, so we can make it
const throughout the driver.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

include/linux/amba/pl08x.h

@@ -172,7 +172,7 @@ struct pl08x_dma_chan {
 	int phychan_hold;
 	struct tasklet_struct tasklet;
 	char *name;
-	struct pl08x_channel_data *cd;
+	const struct pl08x_channel_data *cd;
 	dma_addr_t src_addr;
 	dma_addr_t dst_addr;
 	u32 src_cctl;
@@ -205,7 +205,7 @@ struct pl08x_dma_chan {
  * @mem_buses: buses which memory can be accessed from: PL08X_AHB1 | PL08X_AHB2
  */
 struct pl08x_platform_data {
-	struct pl08x_channel_data *slave_channels;
+	const struct pl08x_channel_data *slave_channels;
 	unsigned int num_slave_channels;
 	struct pl08x_channel_data memcpy_channel;
 	int (*get_signal)(struct pl08x_dma_chan *);