samples/rpmsg: Replace print_hex_dump() with print_hex_dump_debug()

Replace the raw print_hex_dump() call in the rpmsg_sample_cb() function
with the equivalent print_hex_dump_debug() better suited for dynamic
debug. This switch allows flexibility of controlling this trace through
dynamic debug when enabled.

Signed-off-by: Suman Anna <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>

samples/rpmsg/rpmsg_client_sample.c

···
 	dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n",
 		 ++idata->rx_count, src);
 
-	print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
-		       data, len,  true);
+	print_hex_dump_debug(__func__, DUMP_PREFIX_NONE, 16, 1, data, len,
+			     true);
 
 	/* samples should not live forever */
 	if (idata->rx_count >= MSG_LIMIT) {