drm/i915: Remove unused i915_flip tracepoints

The i915_flip* tracepoints are no longer in use since the removal of CS
flip in commit 8b5d27b9 ("drm/i915: Remove intel_flip_work
infrastructure")

References: 8b5d27b9 ("drm/i915: Remove intel_flip_work infrastructure")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180508151552.31024-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_trace.h

@@ -834,42 +834,6 @@ DEFINE_EVENT(i915_request, i915_request_wait_end,
 	    TP_ARGS(rq)
 );
 
-TRACE_EVENT(i915_flip_request,
-	    TP_PROTO(int plane, struct drm_i915_gem_object *obj),
-
-	    TP_ARGS(plane, obj),
-
-	    TP_STRUCT__entry(
-		    __field(int, plane)
-		    __field(struct drm_i915_gem_object *, obj)
-		    ),
-
-	    TP_fast_assign(
-		    __entry->plane = plane;
-		    __entry->obj = obj;
-		    ),
-
-	    TP_printk("plane=%d, obj=%p", __entry->plane, __entry->obj)
-);
-
-TRACE_EVENT(i915_flip_complete,
-	    TP_PROTO(int plane, struct drm_i915_gem_object *obj),
-
-	    TP_ARGS(plane, obj),
-
-	    TP_STRUCT__entry(
-		    __field(int, plane)
-		    __field(struct drm_i915_gem_object *, obj)
-		    ),
-
-	    TP_fast_assign(
-		    __entry->plane = plane;
-		    __entry->obj = obj;
-		    ),
-
-	    TP_printk("plane=%d, obj=%p", __entry->plane, __entry->obj)
-);
-
 TRACE_EVENT_CONDITION(i915_reg_rw,
 	TP_PROTO(bool write, i915_reg_t reg, u64 val, int len, bool trace),