iommu/vt-d: Expose struct svm_dev_ops without CONFIG_INTEL_IOMMU_SVM

The point in providing an inline version of intel_svm_bind_mm() which
just returns -ENOSYS is that people are supposed to be able to *use* it
and just see that it fails. So we need to let them have a definition of
struct svm_dev_ops (and the flags) too.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

include/linux/intel-svm.h

@@ -16,8 +16,6 @@
 #ifndef __INTEL_SVM_H__
 #define __INTEL_SVM_H__
 
-#ifdef CONFIG_INTEL_IOMMU_SVM
-
 struct device;
 
 struct svm_dev_ops {
@@ -55,6 +53,8 @@ struct svm_dev_ops {
  */
 #define SVM_FLAG_SUPERVISOR_MODE	(1<<1)
 
+#ifdef CONFIG_INTEL_IOMMU_SVM
+
 /**
  * intel_svm_bind_mm() - Bind the current process to a PASID
  * @dev:	Device to be granted acccess