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/base/debug.hh

@@ -152,7 +152,8 @@ void dumpDebugFlags(std::ostream &os=std::cout);
  * @ingroup api_trace
  * @{
  */
-#define DTRACE(x) (Debug::x)
+#define DTRACE(x) GEM5_DEPRECATED_MACRO(DTRACE, Debug::x, \
+        "Replace DTRACE(x) with Debug::x.")
 /** @} */ // end of api_trace
 
 #endif // __BASE_DEBUG_HH__