swr/rast: Consolidate archrast Draw events

swr/rast: Consolidate archrast Draw events

Consolidate archrst draw events into single draw event with an attribute
that represents the type of draw

- Add handlers for new private proto versions of DrawInstancedEvent,
  DrawIndexedInstancedEvent, DrawInstancedSplitEvent, and
  DrawIndexedInstancedSplitEvent
- Convert the draw events to generic DrawInfoEvents
- parse_proto_event_fields() replaces 'AR_DRAW_TYPE' as a field type with
  'uint32_t'. This draw type is actually an enum, but can be represented
  as an unsigned integer.
- is_draw_or_dispatch() recognizes DrawInfoEvent as a draw event

Reviewed-by: Bruce Cherniak <bruce.cherniak@intel.com>