misc: Collapse all uses of DTRACE(x) to Debug::x.

Also mark the DTRACE macro as deprecated.

Change-Id: I99d9a9544b539117b375186e3e425d73d3c5cab7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45009
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>

src/cpu/o3/fetch_impl.hh

@@ -1299,7 +1299,7 @@ DefaultFetch<Impl>::fetch(bool &status_change)
             numInst++;
 
 #if TRACING_ON
-            if (DTRACE(O3PipeView)) {
+            if (Debug::O3PipeView) {
                 instruction->fetchTick = curTick();
             }
 #endif