libxl/PCI: make "rdm=" parsing comply with documentation

libxl/PCI: make "rdm=" parsing comply with documentation

Documentation says "<RDM_RESERVATION_STRING> is a comma separated list
of <KEY=VALUE> settings, from the following list". There's no mention
of a specific order, yet so far the parsing logic did accept only
strategy, then policy (and neither of the two omitted). Make "state"
move
- back to STATE_TYPE when finding a comma after having parsed the
  <VALUE> part of a setting,
- to STATE_TERMINAL otherwise.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Wei Liu <wl@xen.org>