sim: Include some required headers in the syscall debug macros header.

Everything that includes syscall_debug_macros.hh and uses the macro in
it will need these headers, so they should be included through
syscall_debug_macros.hh. The consumer shouldn't have to know what the
macros use internally and to include extra headers to support them.

Change-Id: I9bfa932368daec0772d552357ecad8790b4cfead
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23459
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
diff --git a/src/sim/syscall_debug_macros.hh b/src/sim/syscall_debug_macros.hh
index 35a0a05..84ab552 100644
--- a/src/sim/syscall_debug_macros.hh
+++ b/src/sim/syscall_debug_macros.hh
@@ -46,6 +46,8 @@
 #ifndef __SIM_SYSCALL_DEBUG_MACROS_HH__
 #define __SIM_SYSCALL_DEBUG_MACROS_HH__
 
+#include "cpu/base.hh"
+#include "cpu/thread_context.hh"
 #include "debug/SyscallBase.hh"
 #include "debug/SyscallVerbose.hh"