device-dax: rename 'dax_dev' to 'dev_dax'

In preparation for introducing a struct dax_device type to the kernel
global type namespace, rename dax_dev to dev_dax. A 'dax_device'
instance will be a generic device-driver object for any provider of dax
functionality. A 'dev_dax' object is a device-dax-driver local /
internal instance.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/dax/dax.h

@@ -13,13 +13,13 @@
 #ifndef __DAX_H__
 #define __DAX_H__
 struct device;
-struct dax_dev;
+struct dev_dax;
 struct resource;
 struct dax_region;
 void dax_region_put(struct dax_region *dax_region);
 struct dax_region *alloc_dax_region(struct device *parent,
 		int region_id, struct resource *res, unsigned int align,
 		void *addr, unsigned long flags);
-struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
+struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
 		struct resource *res, int count);
 #endif /* __DAX_H__ */