libnvdimm: Convert to DEVICE_ATTR_ADMIN_RO()

Move libnvdimm sysfs attributes that currently use an open coded
DEVICE_ATTR() to hide sensitive root-only information (physical memory
layout) to the new DEVICE_ATTR_ADMIN_RO() helper.

Cc: Vishal Verma <[e-mail]>
Cc: Dave Jiang <[e-mail]>
Cc: Ira Weiny <[e-mail]>
Signed-off-by: Dan Williams <[e-mail]>
Signed-off-by: Vishal Verma <[e-mail]>

drivers/nvdimm/namespace_devs.c

···
 		return -ENXIO;
 	return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
 }
-static DEVICE_ATTR(resource, 0400, resource_show, NULL);
+static DEVICE_ATTR_ADMIN_RO(resource);
 
 static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
 	4096, 4104, 4160, 4224, 0 };

drivers/nvdimm/pfn_devs.c

···
 
 	return rc;
 }
-static DEVICE_ATTR(resource, 0400, resource_show, NULL);
+static DEVICE_ATTR_ADMIN_RO(resource);
 
 static ssize_t size_show(struct device *dev,
 		struct device_attribute *attr, char *buf)

drivers/nvdimm/region_devs.c

···
 
 	return sprintf(buf, "%#llx\n", nd_region->ndr_start);
 }
-static DEVICE_ATTR(resource, 0400, resource_show, NULL);
+static DEVICE_ATTR_ADMIN_RO(resource);
 
 static ssize_t persistence_domain_show(struct device *dev,
 		struct device_attribute *attr, char *buf)