soundwire: Add missing EXPORT for sdw_slave_type

include/sdw_type.h provides the function is_sdw_slave() which
requires sdw_slave_type. But sdw_slave_type was not exported.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20260112140758.215799-2-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: rfvirgil

drivers/soundwire/slave.c

@@ -23,6 +23,7 @@ const struct device_type sdw_slave_type = {
 	.release =	sdw_slave_release,
 	.uevent =	sdw_slave_uevent,
 };
+EXPORT_SYMBOL_GPL(sdw_slave_type);
 
 int sdw_slave_add(struct sdw_bus *bus,
 		  struct sdw_slave_id *id, struct fwnode_handle *fwnode)