x86, fpu: Unbreak FPU emulation

Unbreak FPU emulation, broken by checkin
86603283:
x86: Introduce 'struct fpu' and related API

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <1273135546-29690-3-git-send-email-avi@redhat.com>