drm/i915/trace: Remove unused frequency trace

Commit 3e7abf8 ("drm/i915: Extract GT render power state management")
removes the "trace_intel_gpu_freq_change()" trace points but
their definition was left without users. Remove it.

Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221011135940.367048-1-andi.shyti@linux.intel.com

drivers/gpu/drm/i915/i915_trace.h

@@ -671,21 +671,6 @@ TRACE_EVENT_CONDITION(i915_reg_rw,
 		(u32)(__entry->val >> 32))
 );
 
-TRACE_EVENT(intel_gpu_freq_change,
-	    TP_PROTO(u32 freq),
-	    TP_ARGS(freq),
-
-	    TP_STRUCT__entry(
-			     __field(u32, freq)
-			     ),
-
-	    TP_fast_assign(
-			   __entry->freq = freq;
-			   ),
-
-	    TP_printk("new_freq=%u", __entry->freq)
-);
-
 /**
  * DOC: i915_ppgtt_create and i915_ppgtt_release tracepoints
  *