qemuValidateDomainDeviceDef: Optimize virDomainDeviceInfo validation

qemuValidateDomainDeviceDef: Optimize virDomainDeviceInfo validation

Commit ffda44030a2 added validation of the 'acpiIndex' field in
virDomainDeviceInfo by calling 'virDomainDeviceInfoIterate' from
'qemuValidateDomainDef'. This is overly complicated we have
'qemuValidateDomainDeviceDef' which is already called for every single
device so we can avoid the extra loop.

Restructure the code by calling 'qemuValidateDomainDeviceInfo' directly
from 'qemuValidateDomainDeviceDef' and avoid unnecessary calls to
'virDomainDeviceGetInfo' by calling 'qemuValidateDomainDeviceDefAddress'
from 'qemuValidateDomainDeviceInfo'

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>