nfit: add Microsoft NVDIMM DSM command set to white list

Add the Microsoft _DSM command set to the white list of NVDIMM command
sets.

This command set is documented at:

    https://msdn.microsoft.com/library/windows/hardware/mt604741

Cc: Pavel Machek <pavel@ucw.cz>
[pavel: fix up braces]
Signed-off-by: Stuart Hayes <stuart.w.hayes@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

include/uapi/linux/ndctl.h

@@ -298,6 +298,7 @@ struct nd_cmd_pkg {
 #define NVDIMM_FAMILY_INTEL 0
 #define NVDIMM_FAMILY_HPE1 1
 #define NVDIMM_FAMILY_HPE2 2
+#define NVDIMM_FAMILY_MSFT 3
 
 #define ND_IOCTL_CALL			_IOWR(ND_IOCTL, ND_CMD_CALL,\
 					struct nd_cmd_pkg)