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/kern/linux/events.hh

@@ -64,7 +64,7 @@ class DebugPrintk : public Base
     void
     process(ThreadContext *tc) override
     {
-        if (DTRACE(DebugPrintf)) {
+        if (Debug::DebugPrintf) {
             std::string str;
             std::function<int(ThreadContext *, Addr, PrintkVarArgs)> func =
                 [&str](ThreadContext *tc, Addr format_ptr,