x86: Avoid including arch/x86/registers.hh.

Don't include arch/x86/registers.hh when other, local headers have the
actual information we need.

Change-Id: I9a7407475b04231ac84d9c5bb299915eadec3589
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40337
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>

src/arch/x86/linux/se_workload.cc

@@ -43,6 +43,7 @@
 #include "arch/x86/linux/linux.hh"
 #include "arch/x86/page_size.hh"
 #include "arch/x86/process.hh"
+#include "arch/x86/regs/int.hh"
 #include "arch/x86/se_workload.hh"
 #include "base/trace.hh"
 #include "cpu/thread_context.hh"

src/arch/x86/linux/syscalls.cc

@@ -29,6 +29,7 @@
 
 #include "arch/x86/linux/linux.hh"
 #include "arch/x86/process.hh"
+#include "arch/x86/regs/misc.hh"
 #include "base/trace.hh"
 #include "cpu/thread_context.hh"
 #include "kern/linux/linux.hh"