acpi/nfit, libnvdimm: Add support for issue secure erase DSM to Intel nvdimm

Add support to issue a secure erase DSM to the Intel nvdimm. The
required passphrase is acquired from an encrypted key in the kernel user
keyring. To trigger the action, "erase <keyid>" is written to the
"security" sysfs attribute.

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

include/linux/libnvdimm.h

@@ -180,6 +180,8 @@ struct nvdimm_security_ops {
 			const struct nvdimm_key_data *key_data);
 	int (*disable)(struct nvdimm *nvdimm,
 			const struct nvdimm_key_data *key_data);
+	int (*erase)(struct nvdimm *nvdimm,
+			const struct nvdimm_key_data *key_data);
 };
 
 void badrange_init(struct badrange *badrange);