x86/tboot: Fail extended mode reduced hardware sleep As tboot currently does not support the reduced hardware sleep interface, fail this extended call. Signed-off-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Ben Guthro <benjamin.guthro@citrix.com> Cc: tboot-devel@lists.sourceforge.net Cc: Gang Wei <gang.wei@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>