misc: Remove the m5 namespace

This namespace has gone through the deprecation period
and can now be removed.

Change-Id: Iffc6d903da1d619c0914379d0ceabc88453b3ac7
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/67367
Reviewed-by: Richard Cooper <richard.cooper@arm.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/base/coroutine.hh

@@ -44,7 +44,6 @@
 #include "base/compiler.hh"
 #include "base/fiber.hh"
 
-GEM5_DEPRECATED_NAMESPACE(m5, gem5);
 namespace gem5
 {
 

src/base/stl_helpers.hh

@@ -36,7 +36,6 @@
 
 #include "base/compiler.hh"
 
-GEM5_DEPRECATED_NAMESPACE(m5, gem5);
 namespace gem5
 {