dmaengine: pl08x: constify pointer to char in filter function

The opaque argument chan_id passed to filter function is actually
pointer to const memory, so make that obvious in the filter for code
readability and safety.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240208202742.631307-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/amba-pl08x.c

@@ -2239,7 +2239,7 @@ static int pl08x_resume(struct dma_chan *chan)
 bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
 {
 	struct pl08x_dma_chan *plchan;
-	char *name = chan_id;
+	const char *name = chan_id;
 
 	/* Reject channels for devices not bound to this driver */
 	if (chan->device->dev->driver != &pl08x_amba_driver.drv)