sim,arch: Remove the GuestABI namespace

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

Change-Id: I476815491314f4222da43da75c91654b4f3d1228
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/67374
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Richard Cooper <richard.cooper@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/sim/guest_abi.test.cc

@@ -98,7 +98,6 @@ struct TestABI_TcInit
 namespace gem5
 {
 
-GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
 namespace guest_abi
 {
 

src/sim/guest_abi/definition.hh

@@ -35,7 +35,6 @@ namespace gem5
 
 class ThreadContext;
 
-GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
 namespace guest_abi
 {
 

src/sim/guest_abi/dispatch.hh

@@ -43,7 +43,6 @@ namespace gem5
 
 class ThreadContext;
 
-GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
 namespace guest_abi
 {
 

src/sim/guest_abi/layout.hh

@@ -38,7 +38,6 @@ namespace gem5
 
 class ThreadContext;
 
-GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
 namespace guest_abi
 {
 

src/sim/guest_abi/varargs.hh

@@ -39,7 +39,6 @@ namespace gem5
 
 class ThreadContext;
 
-GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
 namespace guest_abi
 {
 

src/sim/proxy_ptr.hh

@@ -357,7 +357,6 @@ operator + (A a, const ProxyPtr<T, Proxy> &other)
     return other + a;
 }
 
-GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
 namespace guest_abi
 {
 

src/sim/proxy_ptr.test.cc

@@ -474,7 +474,6 @@ struct TestABI
 namespace gem5
 {
 
-GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
 namespace guest_abi
 {
 

src/sim/syscall_abi.hh

@@ -75,7 +75,6 @@ struct GenericSyscallABI32 : public GenericSyscallABI
     }
 };
 
-GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
 namespace guest_abi
 {