arch-x86: missing override specifier

Change-Id: I5a6db4632ec5b670cbfeb7d52190a7545c0b985f
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23380
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed