regmap: Allow regmap_get_device() to be used by modules

Signed-off-by: Mark Brown <[e-mail]>

drivers/base/regmap/regmap.c

···
 {
 	return map->dev;
 }
+EXPORT_SYMBOL_GPL(regmap_get_device);
 
 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
 			       struct regmap_range_node *range,