sparc64: modify sys_dax.h for new libdax

sparc64: modify sys_dax.h for new libdax

Orabug: 25927572

Modify sys_dax.h such that new libdax can be compiled by including this
file unmodified. Userspace does not have u16, u32, etc. types defined and
as stated in Section 5e of Documentation/CodingStyle, we should be using
__u16, __u32, etc. in the ioctl structures which are exported to userspace.

Further, rename the DAXIOC_DEP_[number] ioctls and use DAXIOC_[name]_OLD
instead.

Signed-off-by: Jonathan Helman <jonathan.helman@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Reviewed-by: Sanath Kumar <sanath.s.kumar@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>