This module has no target dependencies (except for target_phys_addr_t
size) and can thus be built as part of libhw.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>