drm/i915: reorder field in gem_request tracepoints

Let's make the order of the fields of the tracepoints involving gem
request match across i915. This makes userspace processing of
tracepoint a bit easier.
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171218151959.14073-2-lionel.g.landwerlin@intel.com

drivers/gpu/drm/i915/i915_trace.h

@@ -641,8 +641,8 @@ DECLARE_EVENT_CLASS(i915_gem_request,
 
 	    TP_STRUCT__entry(
 			     __field(u32, dev)
-			     __field(u32, ctx)
 			     __field(u32, ring)
+			     __field(u32, ctx)
 			     __field(u32, seqno)
 			     __field(u32, global)
 			     ),
@@ -684,9 +684,9 @@ DECLARE_EVENT_CLASS(i915_gem_request_hw,
 		    TP_STRUCT__entry(
 				     __field(u32, dev)
 				     __field(u32, ring)
+				     __field(u32, ctx)
 				     __field(u32, seqno)
 				     __field(u32, global_seqno)
-				     __field(u32, ctx)
 				     __field(u32, port)
 				    ),