sparc64: set the ISCNTRLD bit for SP service handles

sparc64: set the ISCNTRLD bit for SP service handles

Service handles generated by the ds driver can collide with service handles
generated by the SP, causing failures with Domain Services on the SP such
as 'ldom_req_sp_token: set-token failed: no reply' errors.

Ensure that service handles generated by the ds driver do not collide
with service handles generated by the SP by setting the ISCNTRLD bit in
the lower half of the service handle for SP Domain Services. This is
similar to what Solaris does.

Orabug: 25983868

Signed-off-by: Menno Lageman <menno.lageman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com>