lrdp_v2 : fix iommu page table parsing

'struct iommu_device' is renamed to 'struct group_device'
in kernel 4.14.

Change-Id: Ie1f8e25a5865b507de8270a2aee4aa6efc98660d

linux-ramdump-parser-v2/iommulib.py

@@ -84,6 +84,10 @@ class IommuLib(object):
                 'struct iommu_group', 'devices')
             dev = self.ramdump.read_structure_field(
                 dev_list, 'struct list_head', 'next')
+            if self.ramdump.kernel_version >= (4, 14):
+                client_name = self.ramdump.read_structure_cstring(
+                    dev, 'struct group_device', 'name')
+            else:
                 client_name = self.ramdump.read_structure_cstring(
                     dev, 'struct iommu_device', 'name')
         else: