Retire PDO versions 08000009 thru 0800000B

Retire PDO versions 08000009 thru 0800000B

These are the last of the v8 PDO versions. The v9 drivers have been available
for a long time now so these versions can be retired. This allows support for
XENBUS_EVTCHN v4, XENBUS_STORE v1 and XENBUS_GNTTAB v1 interfaces to be
removed.

NOTE: Without this patch then adding new interface versions is essentially
      blocked, as a single extra PDO revision will trigger an assertion in
      PdoQueryId() in XENBUS because the length of the buffer for
      'BusQueryCompatibleIDs' will exceed REGSTR_VAL_MAX_HCID_LEN (1024).

Signed-off-by: Paul Durrant <pdurrant@amazon.com>