drm/i915: More intel_engine_cs renaming

Some trivial ones, first pass done with Coccinelle:

@@
@@
(
- I915_NUM_RINGS
+ I915_NUM_ENGINES
|
- intel_ring_flag
+ intel_engine_flag
|
- for_each_ring
+ for_each_engine
|
- i915_gem_request_get_ring
+ i915_gem_request_get_engine
|
- intel_ring_idle
+ intel_engine_idle
|
- i915_gem_reset_ring_status
+ i915_gem_reset_engine_status
|
- i915_gem_reset_ring_cleanup
+ i915_gem_reset_engine_cleanup
|
- init_ring_lists
+ init_engine_lists
)

But that didn't fully work so I cleaned it up with:

for f in *.[hc]; do sed -i -e s/I915_NUM_RINGS/I915_NUM_ENGINES/ $f; done
for f in *.[hc]; do sed -i -e s/i915_gem_request_get_ring/i915_gem_request_get_engine/ $f; done
for f in *.[hc]; do sed -i -e s/intel_ring_flag/intel_engine_flag/ $f; done
for f in *.[hc]; do sed -i -e s/intel_ring_idle/intel_engine_idle/ $f; done
for f in *.[hc]; do sed -i -e s/init_ring_lists/init_engine_lists/ $f; done
for f in *.[hc]; do sed -i -e s/i915_gem_reset_ring_cleanup/i915_gem_reset_engine_cleanup/ $f; done
for f in *.[hc]; do sed -i -e s/i915_gem_reset_ring_status/i915_gem_reset_engine_status/ $f; done

v2: Rebase.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_trace.h

@@ -487,7 +487,7 @@ TRACE_EVENT(i915_gem_ring_dispatch,
 
 	    TP_fast_assign(
 			   struct intel_engine_cs *engine =
-						i915_gem_request_get_ring(req);
+						i915_gem_request_get_engine(req);
 			   __entry->dev = engine->dev->primary->index;
 			   __entry->ring = engine->id;
 			   __entry->seqno = i915_gem_request_get_seqno(req);
@@ -534,7 +534,7 @@ DECLARE_EVENT_CLASS(i915_gem_request,
 
 	    TP_fast_assign(
 			   struct intel_engine_cs *engine =
-						i915_gem_request_get_ring(req);
+						i915_gem_request_get_engine(req);
 			   __entry->dev = engine->dev->primary->index;
 			   __entry->ring = engine->id;
 			   __entry->seqno = i915_gem_request_get_seqno(req);
@@ -598,7 +598,7 @@ TRACE_EVENT(i915_gem_request_wait_begin,
 	     */
 	    TP_fast_assign(
 			   struct intel_engine_cs *engine =
-						i915_gem_request_get_ring(req);
+						i915_gem_request_get_engine(req);
 			   __entry->dev = engine->dev->primary->index;
 			   __entry->ring = engine->id;
 			   __entry->seqno = i915_gem_request_get_seqno(req);